The progenitors of baleen whales (Mysticeti, Cetacea, Mammalia) underwent a macro evolutionary event that resulted in the loss of their teeth.
The replacement of those teeth with baleen approximately 34 million years ago (Deméré et al. 2008; Marx, 2011).
All baleen whales possess baleen in place of teeth, which they utilize to scoop up plankton, tiny fish, and shrimp-like krill from the water.
The bristly baleen plates in the whales' mouths filter, sift, sieve, or trap their preferred prey from the ocean.
This indicates that whereas baleen whales lost both sets of teeth, toothed whales only lost one of their two sets.
However, even though baleen whales never grow teeth, tooth buds can still be seen in the embryonic stage of such animals. Hence, this is a remnant of its forebear.
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The condition in which an organism has extra sets of chromosomes :
The condition in which an organism has extra sets of chromosomes is known as polyploidy. This has been observed in many examples of plants, including crop plants such as bananas, limes, and strawberries.
As scientists consider it as a chromosomal mutation that may provide benefits to an organism. However, in contrast, having extra sets of chromosomes can also lead to infertility in some organisms as described in 2. Meiosis is the type of cell division that reduces the number of chromosomes in gametes, as described in 3 to maintain the diploid state of somatic cells in sexually reproducing organisms.
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The condition in which an organism has extra sets of chromosomes is known as trisomy.
Errors in meiosis I usually cause Aneuploidy, importantly maternal meiosis I. With advanced maternal age generally errors of maternal meiosis I are associated .Once thought to involve mostly mis-segregation of whole chromosomes, it is now clear that chromatid errors are an equally prevalent cause of maternal meiotic errors.
20 Irrespective, the cytologic mechanism involves decreased or absent meiotic recombination.21 In trisomy 13 and trisomy 21, 90% of these maternal cases arise at meiosis I. Almost all trisomy cases arise in maternal meiosis I. An exception is trisomy 18, in which two thirds of the 90% of maternal meiotic cases arise at meiosis II.
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9. define biodiversity and give three types of biodiversity essential in preserving ecological systems and functions.
The term "biodiversity" describes all species and forms of life found on Earth or in a particular habitat. The three types of biodiversity essential are
genetic diversity, species diversity, and ecosystem diversity.
The term "biodiversity" refers to the variety of species and living forms (including animal, plant, entomological, and other types) as well as their variability, or the processes of evolution in their respective ecosystems.
There are three types of biodiversity, according to conventional wisdom: genetic diversity, species diversity, and ecosystem diversity. These three essential biodiversity preserve ecological system {An "ecological system" (also known as a "ecosystem") is a biological community made up of all the living things (including people) in a specific area as well as the nonliving things (such as air, water, and mineral soil) that the living things interact with.} and functions.
The diversity of genes( Genetic diversity) present in the living world is referred to as genetic diversity. Various genes and gene expressions exist between and within different species. Additionally, this genetic diversity leads to the diversity of life forms, their physical and biological traits, and, in some cases, phenotypes, depending on how those traits interact with their environment.
The diversity of living species ( species diversity) is referred to as species diversity. On Earth, there are millions of different species. Each one is unique and is broken down into groups according to its characteristics (insects, mammals, plants, fungi, etc.).
The diversity of ecosystems, measured by their type and population, in which living things interact with one another and their surroundings is referred to as ecosystem biodiversity. For instance, there are various ecosystems on Earth, each having unique characteristics like deserts, oceans, lakes, plains, or woods. There are unique characteristics within these ecosystems as well, such as cold or hot deserts, tropical or boreal woods, and warm or cold water coastal regions. Every ecosystem has its own quirks, species, and methods of operation.
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The term “biodiversity” describes all species and life forms that occur on Earth or in a particular habitat. 3 biodiversity essential are Genetic diversity, species diversity, ecosystem diversity.
The term “biodiversity” refers to the diversity of species and organisms (including animals, plants, insects and other species) and their diversity or evolutionary processes in their respective ecosystems.
According to popular opinion, there are three types of biodiversity:
Genetic diversity, species diversity, ecosystem diversity. These three important biodiversity conservation ecosystems {“ecosystems” (aka “ecosystems”) comprise all living (including humans) and non-living (air, water, etc.) biological community. , and mineral soils), with which organisms interact. } and functions. The diversity of genes that exist in the living world (genetic diversity) is called genetic diversity. Different genes and gene expression exist between and within different species. Furthermore, this genetic diversity leads to phenotypic diversity, depending on the organism, its physical and biological characteristics and, in some cases, how those characteristics interact with the environment.
The diversity of living species is called species diversity. There are millions of different species on earth. Each is unique and can be divided into groups according to their characteristics (insects, mammals, plants, fungi, etc.).
The diversity of ecosystems, measured by species and populations, is called biodiversity of ecosystems in which organisms interact with each other and with the environment. For example, there are many different ecosystems on Earth, each with unique characteristics such as deserts, oceans, lakes, plains, and forests.
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Organisms are classified today using the Linnaean system, and the following table shows the taxonomic classification of two marine organisms living along the Pacific Coast. Taxonomic Classification, Common dolphin, Killer whale, Animalia, Animalia, Chordata, Chordata, Vertebrata, Vertebrata, Mammalia, Mammalia, Cetacea, Cetacea, Delphinidae, Delphinidae, Delphinus, Orcinus, delphis, orca, Taxonomic classification is important to marine biologists because it provides a way to -
Marine biologists value the taxonomic classification because it demonstrates the existence of marine evolution.
Every marine organism is known to science and has a name. We can identify marine animals and determine relationships among them, or we can say that Latin is the universal and the language of marine biology. The objective is to categorise what we do discover and ensure that there is a classification that is used universally. Because you don't want people calling the same animal by different names. Therefore, everyone refers to the same species by the same name. Thus, it's crucial for research. Each of you must be knowledgeable in the subject at hand. Additionally, it implies that you can use this classification system to determine how closely related different organisms are.
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How does DNA differ from person to person?
Any two people on Earth have 99.6 percent identical DNA. However, 0.4 percent variation represents approximately 12 million base pairs, which can account for many of the differences between individuals, particularly if the changes occur in key genes. Our surroundings also contribute to our uniqueness
substances can move across the plasma membrane in two different ways—actively or passively. this activity will help you determine whether transport mechanisms actively or passively move substances across the membrane.
Active transport is the use of cellular energy to transfer materials across the plasma membrane against a concentration gradient. Contrarily, passive transport is the transfer of chemicals across the plasma membrane along a gradient of concentration without the need for cellular energy.
There are two main strategies to transfer molecules across a membrane, and the difference is related to the usage of cell energy. Active transport needs energy to operate, whereas passive systems like diffusion don't.
Because maintaining exact concentrations of different molecules is essential for cell function, transport across a cell membrane is a process that is highly regulated.. A molecule engages in passive transport when it goes down its concentration gradient; active transport takes energy when it moves up the gradient.
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Based on Energy requirement, The transport Across Plasma Membrane is of two types as Active Transport and Passive Transport.
Active Transport requires energy in the form of Adenosine Triphosphate ( ATP).It is the transport from high concentration to low concentration against the concentration gradient.Active transport is done across plasma membrane by utilizing a Transmembrane protein.It is also known as uphill transport.
Sodium Potassium Pump is an example for Active Transport. In this pump three sodium ions are transported out and two Potassium ions are transported to the inside of the cell. The cell always maintains a high concentration of Potassium ions inside the cell, further transport of K+ require energy in the form of ATP.
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how many daughter cells are created at the end of meiosis i
Answer:
Four haploid daughter cells are created at the end of meiosis 1
How can DNA mutation affect the function of a protein?
Gene variants (also known as mutations) can sometimes prevent one or more proteins from functioning properly. A variant can cause a protein to malfunction or not be produced at all by changing the instructions for making a protein in a gene
When a heterozygous genotype results in a phenotype that is intermediate between the two homozygous conditions, this type of inheritance is referred to as A: incomplete dominance B: codominance C: polygenic D: complete dominance.
Answer:
Incomplete dominance
Explanation:
If an heterozygous genotype has an intermediate phenotype then this type of inheritance is called incomplete dominance.For eg in case of Antirrhinum majus the flower with homozygous dominant alleles is red in color and the flower with homozygous recessive allele in white in color but in heterozygous condition the flower colour is pink .Here on gene is not completely dominant over other and hence results in an intermediate phenotype.We should keep in mind that dominance depends upon the gene product , phenotype from this product and upon the phenotype that we choose to examine .the cell membrane acts as a good the cell membrane acts as a good source of ions. electrical conductor. electrical insulator. electrical gradient.
Cell membrane isolates the cell from surrounding. It acts like Electrical conductor, Electrical insulator and electrical gradient at different time in different situations.
All cells have cell membranes that isolate them from their surroundings. The phospholipid protein bilayer that makes up the cell membrane is an excellent insulator. The cell membrane's dielectric constant is around 9. The membrane divides the conductor-filled intracellular and external fluids. Ions make up the free charges in these conductors. For human cells, the interior of a cell is an equipotential volume with a potential that is roughly -60 to -90 mV lower than that of the extracellular fluids.
There is a significant amount of dissolved salts in the fluid both inside and outside of a cell. Salts create positively and negatively charged ions when they dissolve in water. In the majority of cells, the concentration of sodium ions (Na+) outside the cell is higher than the concentration of potassium ions (K+) inside the cell. Despite being a good insulator, the cell membrane has channels where ions can leak. An ion channel often only allows certain kinds of ions to pass through it. Channels can be always open or gated, passive or active, and both.
Electrical gradient in biological solutions refers to the electrical potential acting on an ion to cause the ion to flow in one way or another. When an ion's concentrations are unevenly distributed across a permeable membrane, the ion will simply diffuse across the membrane from the region of higher concentration to the region of lower concentration. Ions also possess an electric charge, which when applied to a membrane creates an electric potential.
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The cell membrane isolates the cell from the environment. It acts like an electrical conductor, an electrical insulator and an electrical gradient at different times in different situations.
All cells have a cell membrane that isolates the cell from its surroundings. The phospholipid-protein bilayers that make up cell membranes are excellent insulators. The dielectric constant of the cell membrane is about 9. The membrane separates the ladder-filled intracellular and external fluids. Ions form free charges on these conductors. For human cells, the interior of the cell is an isopotential volume with a potential approximately -60 to -90 mV lower than that of the extracellular fluid.
An electrical gradient in a biological solution refers to a potential acting on ions that causes them to flow in some direction. If the concentration of ions is unevenly distributed across the permeable membrane, the ions simply diffuse across the membrane from areas of high concentration to areas of low concentration. Ions also carry an electrical charge, which creates an electrical potential when applied to a membrane.
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Which of the following plant diseases is caused due to poor water circulation in the system?
The health of plants in interiorscapes, producing fields, gardens, and landscapes is threatened by a wide range of issues.
What are Plant disease?These issues may have minor cosmetic effects on the plant or more serious ones that have the potential to cause plant mortality, crop loss owing to poor yield and quality, and plant deformity.
Plant health issues continue to have a significant impact on our daily lives and have had a significant historical impact on human civilisation and culture. Food, fiber, aesthetic, and natural environment plants are all impacted by plant diseases.
The late blight on potatoes stands out among these ailments. In the 1840s, epidemics of this illness, brought on by Phytophthora infestans, swept widely over Ireland and Europe.
Therefore, The health of plants in interiorscapes, producing fields, gardens, and landscapes is threatened by a wide range of issues.
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Together, the ______ system and the ______ system coordinate and execute communication throughout the body.
Together, the nervous system and the endocrine system coordinate and execute communication throughout the body.
Action potentials, which are electrical signals that cells in the nervous system transmit, are used to coordinate and regulate bodily processes. It consists of the brain, spinal cord, and limber nerves. It takes effect swiftly, and its effects are transient.
On the other side, the endocrine system is a network of glands that create and secrete hormones into the blood. In order to control different physiological processes, hormones operate as chemical messengers that go throughout the body and interact with specific target cells. It has longer-lasting effects and operates more slowly.
Both systems cooperate to keep the body's internal environment in balance, or at homeostasis, and to plan how the body will react to both internal and external changes.
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Together, the nervous system and the endocrine system coordinate and execute communication throughout the body.
Action potentials, which are electrical signals sent by nerve cells, are used to coordinate and regulate bodily processes. It is made up of the brain, the spinal cord, and the limber nerves. Its effects are transient and take effect quickly.
The endocrine system, on the other hand, is a network of glands that produce and secrete hormones into the blood. Hormones act as chemical messengers that travel throughout the body and interact with specific target cells to control various physiological processes. It has a longer duration of action and operates more slowly. Both systems work together to maintain the body's internal environment in balance, or homeostasis, and to plan how the body will respond to internal and external changes.
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in an open fermenter, the yeast cells are under less hydrostatic pressure which is the reason these yeast are said to do what for the beer?
In an open fermenter, the yeast cells are under less hydrostatic pressure the reason these yeast are said to do what for the beer is to produce more fruity esters.
As in the substitution process between a carboxylic acid and an alcohol, an ester is a molecule formed from an oxoacid (organic or inorganic) in which at least one hydroxyl group (OH) is replaced by an alkoxy group (OR). Since glycerides are one of the main groups of lipids and make up the majority of animal fats and vegetable oils, they are significant in biology.
Glycerides are fatty acid esters of glycerol. Most esters have a pleasant aroma; those with a low molecular weight are frequently utilized as fragrances and can be found in pheromones and essential oils. They are one of the most prevalent kinds of synthetic lubricants on the market and serve as high-grade solvents for a variety of plastics, plasticizers, resins, and lacquers.
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In open fermenters, these yeasts have to produce more fruity esters in beer because the yeast cells have a lower hydrostatic pressure.
Similar to the substitution process between carboxylic acids and alcohols, esters are molecules formed from oxoacids (organic or inorganic) in which at least one hydroxyl group (OH) has been replaced with an alkoxy group (OR). Glycerides are one of the major groups of lipids and are important in biology as they make up the majority of animal fats and vegetable oils.
Glycerides are glycerol fatty acid esters. Most esters have a pleasant scent. The lower molecular weight ones are commonly used as fragrances and are found in pheromones and essential oils. They are one of the most widely used synthetic lubricants on the market and act as high quality solvents for a wide variety of plastics, plasticizers, resins and paints.
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The coldest water will be found in which part of the ocean? A. the deepest regions B. near large land masses C. the areas with the most salt D. the part closest to the equator
Answer: The coldest water in the ocean is typically found in the deepest regions. The deep ocean is colder than the surface waters because it is far from the sun's warming rays and it is also insulated by the overlying water layers. The temperature of the deep ocean can be as low as just above freezing point (0°C or 32°F).
The areas with the most salt can also have a slightly lower temperature because salt water has a higher density than fresh water, and thus it can retain the cold more than fresh water.
It's important to note that the ocean temperature varies depending on the location, time of the year, and depth. The ocean temperature near the poles is generally colder than the temperature near the equator, and also the ocean temperature near the coast can be affected by the land masses and currents.
what is the packages proteins within the cell and makes lipids
The packages proteins within the cell and makes lipids is the endoplasmic reticulum (ER).
According to source , the ER "packages proteins within the cell and makes lipids." It is also noted in source that the ER "packages proteins within the cell and makes lipids." Additionally, mentions that lipids are a group of compounds that are found in living organisms, including prokaryotes and eukaryotes, and play many important roles biologically, such as membrane formation, protection, insulation, energy storage, cell division and more. However, it is not specified which organelle is responsible for the production of lipids in the cell.
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How does an enzyme speed up a chemical reaction
Answer:
Helping to lower the activitation energy needed to start reaction
Explanation:
biotech crops have enabled farmers to increase the use of pesticides with marginal increases in environmental impact. question 1 options: true false
Biotech crops contribute fundamentally to paring the arrival of ozone-depleting drift shots from horticultural practices - for the most part from less fuel use and extra soil carbon capacity from decreased culturing.
All the more as of late, the utilization of biotechnology has prompted new pesticide items that control different irritations. These organically delivered pesticides, which utilize the intrinsic irritation-battling capacities of many existing plants and microorganisms, have properties that recognize them from those of traditional synthetic pesticides.
Biotechnology has assisted with expanding crop efficiency by presenting such characteristics as infection obstruction and expanded dry season resilience to the harvests. Presently, researchers can choose qualities for infection obstruction from different species and move them to significant harvests.
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Biotech crops have enabled farmers to increase the use of pesticides with marginal increases in environmental impact is true statement.
The greatest explanation for pests' existence is the evolution of genetic resistance. Pest droppings are the most overt sign of an infestation. If you find any droppings around your home or on any property you own, you may be positive that a pest is there.
Animal waste is the most typical sign of a pest infestation. Check your establishment for any urine or faeces trails. Keep in mind that waste produced by tiny pests, like bed bugs, is sometimes harder to spot than waste produced by larger pests, such rats or mice. Therefore, a thorough inquiry is necessary.
Agricultural biotechnology seeds benefit farmers. Agriculture biotechnology is a safe and advantageous technology that supports both environmental and economic sustainability, according to decades' worth of documented evidence. Because transgenic crops enhance output and reduce production costs, farmers favor them.
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2. Which statement correctly applies the theory of natural selection to giraffes?
Giraffes wrap their bodies around their offspring, ultimately resulting in their limbs growing longer, and they pass along that trait to offspring.
Giraffes born with longer necks can get more food, survive longer, and reproduce, and they pass along that trait to offspring.
Giraffes born with longer necks more easily attract a mate, resulting in them reproducing and passing along their traits to offspring.
Giraffes constantly lift their heads to reach leaves on trees, ultimately resulting in their necks growing, and they pass along that trait to offspring.
Giraffes constantly lift their heads to reach leaves on trees, ultimately resulting in their necks growing, and they pass along that trait to offspring. Option D
What is natural selection?When we talk about the term natural selection, we are referring yo the fact that some organisms are able to survive better in their habitat because of the fact that they posses some very unique traits.
All of these unique traits that the organism has can be passed on to the offspring and that we call the process of natural selection since it is only the organisms that have these traits that can be able to live long and survive.
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in certain breeds of dogs, black color (b) is dominant and red color is recessive (b). solid color is dominant (s) and spotting is recessive (s). a homozygous black male is crossed with a red-and-white spotted female. what is the probability of them producing a solid black puppy?
Run about Trihybrid crosses again, and we are looking at a canine with some traits then. Each right, flashback the mongrel means 2 traits each right, so we have a black Alaric's dominant okay.
Under the hand is dominant, which means small homosagas are black. Now, let's cross this figure, pluck, which means bab and portentous for both red and white, spotted womanish, so to be crossed with red and white sporting. So, if you do, these 16 by 16 at the table, realize that you will have all of these individualities or will be b b s s all of them. So there is just 1 distinct fino type, that is 100 percent.
So we anticipate these to be black and white spotted all right that that is the answer, which means that the probability of them producing a solid black doggy is Trihybrid crosses. Still, they'll be the better place set producing black and white spotted individualities each right.
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The probability that the mating of homozygous male parent with solid black trait with a red and white spotted parent be a solid black off spring is 100%.
This kind of mating is an example of di-hybrid cross, in which if the male dog is solid black then his allele pair would be [tex]BBSS[/tex]. If the female parent is red and white spotted, then her allele pair would be [tex]bbss[/tex]. Therefore in the off spring, the allele pairs [tex]BS[/tex] and [tex]bs[/tex] will be present and when they will be put together in Punnett square, the dominant characters will show up in the off spring. The doggy will be solid black but the traits will be heterozygous in nature. Hence we can say that a homozygous cross in parents will result in 100% production of heterozygous off spring with the dominant characters over the recessive characters.
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8. If you had to choose between defending the statement: "adaptations are given to organisms", or the statement: "adaptations are earned
by organisms", which one would you choose to defend and why?
The statement adaptations are earned by organism better justify the definition of the adaptation.
It implies that adaptations are predestined or dictated by some external factor, such as genetics or evolution, when it says that "adaptations are provided to organisms." This viewpoint places a strong emphasis on how natural selection shapes the traits of organisms.
Also, "Adaptations are earned by organisms," adaptations are the results of an organism's own activities or behaviors, and organisms actively strive to create adaptations in response to their environment. This viewpoint stresses how much each organism shapes its own traits.
Thus adaptation appear as the organism is trying to better fit into the environment thus earning them for its survival.
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I would choose to defend the statement that adaptations are given to organisms. This is because most adaptations are genetically determined and occur naturally through processes such as natural selection and mutation.
As such, organisms are not actively involved in the development of their adaptations, and instead, receive them as a result of their environment and the evolutionary history of their species.
For example, the black and white stripes of a zebra are a result of natural selection, where the pattern helps them blend into their environment and avoid predators.
This adaptation was not something the zebra had to learn but was instead a trait that their species had evolved over time. Similarly, the long necks of giraffes were developed to help them reach higher leaves and the webbed feet of ducks were developed to aid in swimming. Ultimately, most adaptations come from evolutionary processes such as natural selection and mutation, rather than decisions or actions taken by the creatures themselves.
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what type of observational research studies a large group of individuals in a specific population, which may assist in identifying nutrition and exercise patterns in the population?
A cohort study is a type of observational research that studies a large group of individuals in a specific population, which may assist in identifying nutrition and exercise patterns in the population.
In a cohort study, a group of individuals is selected and followed over time to assess the relationship between a specific exposure (such as a certain diet or exercise pattern) and a specific outcome (such as incidence of heart disease or obesity). Cohort studies can provide valuable insights into the natural history of a disease and can help identify risk factors for the development of certain conditions. They are often used in the field of nutrition and exercise research to understand the impact of these factors on health outcomes.
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"degenerative muscle disease inclusion body myositis" who created this article?
Yunis and Samaha coined the phrase "inclusion body myositis" in 1971.
Vacuoles and filamentous inclusions are a common pathogenic feature of sporadic inclusion body myositis (s-IBM) and hereditary inclusion body myopathies (h-IBM), two different illnesses. They show a wide range of clinical manifestation, age of onset, concomitant disorders, and prognosis when taken as a whole. The subject of this article is s-IBM. The reader is pointed in the direction of other sources for discussion of h-IBM.
In 1971, Yunis and Samaha coined the name "inclusion body myositis" to describe a case of myopathy that phenotypically resembled chronic polymyositis but revealed inclusion bodies and cytoplasmic vacuoles upon muscle biopsy. The disorder has gained more attention in the years since and better histologic techniques have led to an increase in the recognition and reporting of s-IBM.
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"degenerative muscle disease inclusion body myositis" article was created by Mazen M. Dimachkie, M.D. and Richard J. Barohn, M.D.
In their article, they talk about A group of rare diseases known as idiopathic inflammatory myopathies has a lot in common with one another. Dermatomyositis (DM), polymyositis (PM), necrotizing myopathy (NM), and sporadic inclusion body myositis (IBM) are a few examples of these conditions. Chronic proximal leg and distal arm asymmetric muscle weakness is the most common idiopathic inflammatory myopathy after age 50 in inclusion body myositis.
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Part Two
Text Version
Using the diagram above, answer the following questions:
True or False. The arrow labeled C represents a transfer of chemical energy to mechanical energy. Explain why this is true or false. False because it goes to chemical to thermal.
True or False. The arrow labeled A represents a transfer of solar energy to chemical energy. Explain why this is true or false. True because it goes from the sun which is thermal to the plant and that photosynthesis which is chemical.
Which arrow or arrows represent a release of carbon dioxide? What process is occurring at the arrow(s) you selected?
Which arrow or arrows indicate a process that cycles carbon from living or nonliving organisms? Describe the process or processes you selected.
Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer.
(If you can find the mag that be great)
The correct responses are
1) True
2) True because it is the process of photosynthesis for trapping solar energy.
3) F and C, they involve the combustion of matter and cellular respiration respectively
4) C and E because in these carbon is returned by putrefaction or combustion.
5) A and B represent the conservation of mass since they can be represented by chemical reactions.
What is the image?In the image attached we can see that there is the transition of energy from one form to the other. We have to recall that following the first law of thermodynamics, energy can not be created nor destroyed but can be transformed from one form to the other.
In this case, we can see that there are many kinds of energy transformations that are taking place in the image that is shown in the carbon cycle.
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which observation suggests that eukaryotes may share a more recent common ancestor with bacteria than with archaea?
a. behavioral traits
b. the tree that represents the fewest evolutionary changes, in either DNA sequences or morphology
c. gross morphological traits
d. Many genes that affect metabolism in yeast are more similar to bacterial than archaeal genes.
d) Many genes that affect metabolism in yeast are more similar to bacterial than archaeal gene represent the correct option for the ancestor of eukaryotes.
The three main categories of life are eukaryotes, bacteria, and archaea. Eukaryotes are organisms with complex cell structures that include membrane-bound organelles and a nucleus. Prokaryotic species, such as bacteria and archaea, have a more straightforward cell structure and no membrane-bound organelles.
It has been suggested that eukaryotes and bacteria have a more recent common ancestor than with archaea based on genetic and molecular investigations. This hypothesis is backed by the finding that several genes involved in metabolism in yeast, a eukaryote, resemble bacteria more than archaea. This shows that rather than an archaeal ancestor, eukaryotes may have descended from one.
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d) Many genes that affect metabolism in yeast are more similar to bacterial genes than archaeal genes, indicating that the ancestor of eukaryotes was a bacterial gene.
Eukaryotes, bacteria, and archaea are the three major types of life. Eukaryotes have complex cell structures that include membrane-bound organelles and a nucleus. Prokaryotic organisms, such as bacteria and archaea, have a simpler cell structure with no membrane-bound organelles.
Based on genetic and molecular evidence, it has been proposed that eukaryotes and bacteria share a more recent common ancestor than archaea. This hypothesis is supported by the discovery that several genes involved in metabolism in yeast, a eukaryote, are more similar to bacteria than archaea. This suggests that eukaryotes may have descended from something other than an archaeal ancestor.
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how many nucleotides comprise a single strand of dna
The DNA not only contains the bases adenine( A), cytosine( C), guanine( G),but it also contains thymine( T)( T).
All the bases come in particular dyads( A with T, and G with C). Nearly all living cells have DNA. Its precise placement within a cell, still, is dependent on whether or not that cell has a unique, membrane- bound organelle called a nexus. Eukaryotes are defined as organisms made of cells with capitals, whilst prokaryotes are defined as organisms made of cells without capitals. DNA is stored within the nexus of eukaryotes, but since prokaryotes warrant a nexus, it's set up incontinently within the cellular cytoplasm. In a nutshell, DNA is a complicated patch made up of multitudinous corridor, a bit of which
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Adenine (A), Cytosine (C), and Guanine (G) are the three bases that make up DNA. Thymine (T) is also a base.
There are specific dyads for each base ( A with T, and G with C). DNA is present in almost every living cell. However, whether or not a cell possesses a special, membrane-bound organelle called a nexus will determine where exactly it is located within that cell. Prokaryotes are defined as organisms made of capital cells, whereas eukaryotes are defined as organisms made of capital cells. DNA is kept in the nexus of eukaryotes, but because prokaryotes require a nexus, it is arranged haphazardly inside the cellular cytoplasm. DNA is a complex patch made up of numerous corridors, each of which contains a variety of information. to understand.
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Describe a possible food chain made up of
common organisms in the city park ecosystem
shown. Tell what might happen if all of one type of
organism moved away.
Answer:
Explanation:
1. Grass and other plants as the primary producers
2. Grasshoppers and other insects as herbivores
3. Sparrows, robins, and other small birds as primary consumers that eat the insects
4. Hawks and other larger birds as secondary consumers that eat the smaller birds
5. Foxes, raccoons, and other mammals as tertiary consumers that eat the birds and small mammals
If all of the grasshoppers were to move away, the population of small birds that rely on them for food would likely decrease. This could also lead to a decrease in the population of larger birds and mammals that eat the smaller birds. In turn, this could result in a population increase of the plants that the grasshoppers were previously eating.
Which of the following incorrectly matches the term with its location?
A. DNA is found in a chromosome.
B. Chromosomes are found in the nucleus of a cell.
C. Genes are located in a nucleotide.
D. Nitrogen bases are located in the central rungs of a DNA ladder.
A purebred red flower is crossed with a purebred white flower. Determine all possible genotypes and phenotypes for the offspring. (Red is dominant.)
Could you please explain why as well?
Answer:
Explanation:
The genotype of a purebred red flower is RR, and the genotype of a purebred white flower is rr. When these two flowers are crossed, their offspring will have the genotype Rr, because each parent will pass on one copy of their allele (R or r) to their offspring.
The R allele is dominant, so any offspring with at least one R allele will have the phenotype of red. The only way for an offspring to have a white phenotype is for it to have two copies of the recessive r allele (rr). Therefore, all possible phenotypes for the offspring are red.
In a Punnett square, where the alleles of the parents are represented on the top and left sides, and the possible offspring genotypes are represented in the boxes, it would look like this:
R R
r Rr
r Rr
As you can see, all possible genotype of the offspring is Rr and the phenotype is Red.
Drag each label to the correct location. sienna decides to study movement in plants. identify the correct sequence of the scientific steps, and place the steps in order. she developed a hypothesis that plants move toward light. over six weeks, both plants grew toward their available light source. she put one plant near the window and another in a dark room with a small opening that let light come through. every few days she checked the plants and recorded the direction of their growth.
the scientific steps that Sienna followed in her research:
Develop a hypothesis: Sienna developed a hypothesis that plants move toward light.
Experiment Design: Sienna put one plant near the window and another in a dark room with a small opening that let light come through.
Data collection: Every few days she checked the plants and recorded the direction of their growth over a period of six weeks.
Data analysis: Sienna analyzed the data she collected to see if the plants grew in the direction of the light source, and if her hypothesis was supported.
Conclusion: Sienna drew a conclusion from her data analysis and determined whether her hypothesis was supported or not.
Communication: Sienna reported her findings in a scientific paper or presentation, communicating her results and conclusions to other scientists in her field.
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individuals who live in locations with limited exposure to sunlight can have abnormal bone development due to an inability to absorb calcium and phosphate ions from the small intestine. why does a limited exposure to sunlight cause abnormal bone development?
Limited exposure to sunlight causes abnormal bone development because sufficient amounts of vitamin D3 will not be generated.
Cholecalciferol, often known as vitamin D3, is essential for the body's ability to absorb calcium and phosphate ions normally. Sunlight causes cells in the epidermis to produce vitamin D3 in response to the body's needs. Without adequate time spent in the sun, the body is unable to generate sufficient amounts of vitamin D3.
A failure to uptake phosphate and calcium from the intestinal tract can lead to improper bone growth in those who live in places with low levels of solar exposure. These people also have a greater risk of developing osteoporosis.
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geomyces destructans is the fungus responsible for white-nose syndrome in bats. what level of the biological hierarchy is represented by the carbohydrates, lipids, and proteins that are found in this fungus?
Explanation:
Scientists have observed cells take in other things by "pinching in," a process called__.
A. exocytosis
B. infolding
C. enveloping
D. inferring