Red blood cells carry a specific type of protein, called hemoglobin, which is able to bind oxygen and release it in other tissues. A nerve cell doesn't have this protein because it doesn't need to bind oxygen. Instead, the nerve cell uses other proteins that help it transmit signals to other cells.
The decimal reduction time (DRT) to kill 90% of cell present for autoclaving a culture is 1.5 minutes. How long would it take to kill all the cells if 106 cells were present? What would happen if you stopped the heating process at 9 minutes?
Answer:
10.5minutes
Explanation:
DRT = 90%
Cells present = 10^6
Autoclaving = 1.5 minutes
Solution:
10^6(1.5)10^5(1.5)10^4(1.5)10^3(1.5)10^2(1.5)10^1(1.5)10^0(1.5)0=10.5
it would take it approximately 10.5 minutes to kill 10^6 of the cells.
If i should stop the heating process at 9 minutes this would have effect on some of the microbes as they are still present with 1 bacterium left which makes it not efficient.
XR
Why do lunar and solar eclipses not happen every month?
Eclipses only occur during full and new moons.
Earth rotates around its axis faster than the moon.
The moon and Earth only travel through the penumbras.
The moon’s axis does not always align with Earth’s shadow.
Answer:
Eclipses only occur during full and new moons. Earth rotates around its axis faster than the moon. ... The moon's axis does not always align with Earth's shadow.
Explanation:
Answer:
The moon's axis does not always align with Earth's shadow.
Explanation:
The Earth goes around the Sun, while the moon goes around the Earth, so all of them lining up exactly doesn't happen that much. I also jus got it right.
Help me guys!! (Giving brainliest)
Answer: C
Explanation:
C because the cell membrane is semi permeable which means only certain substances can enter and exit.
Two different groups of scientists studying a rare trait in ground squirrels report very different heritabilities. What factors influencing heritability values make it possible for both conclusions to be correct?
Answer:
It is a trait highly influenced by environmental factors (i.e., it has low heritability)
Explanation:
In population genetics, heritability is a statistical measure to estimate the proportion of the phenotype variation of a given trait which can be explained by hereditable genetic factors. The heritability of a trait is influenced by environmental factors, genetic factors (e.g., allele frequencies, number of genes involved in trait variation, recombination rate, etc), and the interaction between genetic and environmental factors. A low heritability value suggests that most of the variation is not genetic (i.e., due to environmental factors), while a high heritability value suggests that almost all of the variability in a trait is due to genetic factors.
What is the role of DNA polymerase in DNA replication?
A. It ties the chunks of DNA together.
B. It creates the replication fork.
C. It checks the DNA for errors.
D. It breaks apart the bases.
Answer: it checks the DNA for errors
Explanation:
Just took test
Answer:
A. ties chunks of dna together, took the test
Explanation:
35 points please help science biology
Euglena are unicellular organisms classified into the Kingdom Protista, and the Phylum Euglenophyte. All euglena have chloroplasts and can make their own food by photosynthesis. They are not completely autotrophic though, euglena can also absorb food from their environment; euglena usually live in quiet ponds or puddles.
Euglena move by a flagellum (plural ‚ flagella), which is a long whip-like structure that acts like a little motor. The flagellum is located on the anterior (front) end, and twirls in such a way as to pull the cell through the water. It is attached at an inward pocket called the reservoir. Color the reservoir grey and the flagellum black.
The Euglena is unique in that it is both heterotrophic (must consume food) and autotrophic (can make its own food). Chloroplasts within the euglena trap sunlight that is used for photosynthesis, and can be seen as several rod like structures throughout the cell. Color the chloroplasts green. Euglena also have an eyespot at the anterior end that detects light, it can be seen near the reservoir. This helps the euglena find bright areas to gather sunlight to make their food. Color the eyespot red.Euglena can also gain nutrients by absorbing them across their cell membrane, hence they become heterotrophic when light is not available, and they cannot photosynthesize.
The euglena has a stiff pellicle outside the cell membrane that helps it keep its shape, though the pellicle is somewhat flexible and some euglena can be observed scrunching up and moving in an inchworm type fashion. Color the pellicle blue.
In the center of the cell is the nucleus, which contains the cell's DNA and controls the cell's activities. The nucleolus can be seen within the nucleus. Color the nucleus purple, and the nucleolus pink.
The interior of the cell contains a jelly-like fluid substance called cytoplasm. Color the cytoplasm light yellow. Toward the posterior of the cell is a star-like structure: the contractile vacuole. This organelle helps the cell remove excess water, and without it the euglena could take in some much water due to osmosis that the cell would explode. Color the contractile vacuole orange.
What molecule, when linked
with others, creates a single link
in the DNA chain?
Answer:Figure 4: Double-stranded DNA consists of two polynucleotide chains whose nitrogenous bases are connected by hydrogen bonds.
Explanation::))))))))))))))))))))))
Determine the identity of an atom
Answer:
The number of protons in one atom of an element determines the atoms identity.
In science, which of the following best describes the scientific term
theory? *
A) An educated guess
B) An idea with lots of evidence to support it
C) possible idea that needs more evidence to be real science
D) An undisputed law that will not change.
PLEASE ANSWER!!!!!!!
Answer:
here's your answer
Explanation:
b) an idea with lots of evidence to support it .
In science, the word theory refers to a comprehensive explanation of an important feature of nature that is supported by many facts gathered over time. Theories also allow scientists to make predictions about as yet unobserved phenomena.
Which type of rock does B represent?
Group of answer choices
Do the same mechanisms that govern gene expression operate in bacterial cells and eukaryotic cells? Explain your answer.
Answer:
in prokaryotic cells, the control of gene expression is mostly at the transcriptional level. ... Eukaryotic gene expression is regulated during transcription and RNA processing, which take place in the nucleus, and during protein translation, which takes place in the cytoplasm.
what is the last thing that happens when a cell divides to produce two new identical cells
Answer:
The last phase of cell division is cytokinesis. In this phase the cytoplasm of parent cell divides in to two cells called as daughter cells. It occurs during late stages of nuclear division.
The visible change of cytokinesis in an animal cell can be observed as formation of Furrow or Pucker on the cell surface.
Let's suppose you were interested in developing drugs to prevent epigenetic changes that may contribute to cancer. What cellular proteins would be the target of your drugs?
Answer:
Potential targets:
1- DNA methyltransferases
2- Chromatin modifiers such as histone acetyltransferases, histone deacetylases, histone methyltransferases, etc.
3- Components of the RNA interference (RNAi) machinery such as Dicer, Argonaute, etc.
Explanation:
Epigenetics can be defined as the study of any heritable change in the phenotype that does not involve modifications in the DNA sequence. Epigenetic mechanisms can be classified into three major types: 1-DNA methylation, 2-histone modifications (e.g., acetylation, methylation, phosphorylation, etc), and 3-regulatory non-coding RNAs (e.g., miRNAs, lncRNAs, siRNAs, etc) that modulate target gene expression via the RNA interference pathway. There are different types of proteins that are involved in these complex epigenetic mechanisms, and those cited above represent only some examples that can be used as therapeutic targets.
what does carbon footprint mean???
Answer:
A carbon footprint is the total greenhouse gas emissions caused by an individual, event, organization, service, or product, expressed as carbon dioxide equivalent.
Explanation:
Answer:
The amount of carbon dioxide a person produces
Explanation:
How do
you think humans can impact the
biosphere by affecting the biogeochemical
cycles?
Answer:
hope this will help u
Explanation:
Biogeochemical Cycles
Human activities have greatly increased carbon dioxide levels in the atmosphere and nitrogen levels in the biosphere. Altered biogeochemical cycles combined with climate change increase the vulnerability of biodiversity, food security, human health, and water quality to a changing climate.
Explore interactions between climate change and biogeochemical cycles.
Answer:
Human activities
moreover, biogeochemical cycles combined with climate change increase the vulnerability of biodiversity, food security, human health, and water quality to a changing climate.
What's the difference between a statute and a regulation in the US?
A. Statutes are laws passed by federal agencies, while regulations are laws passed by Congress
B. They're the same thing. Laws and regulations express the same concept.
C. Statutes are laws passed by Congress, while regulations are laws passed by federal agencies
D. Citizens that break the law are subject to heavier penalties, whereas breaking regulations would only result in fines at the worst
Answer:
A. Statues are laws passed by federal agencies, while regulations are laws passed by Congress.
Explanation:
A statute is a law, enacted by the state or federal legislature. Regulations are rules set by agencies that fill in the ambiguous areas of laws
Budding is a type of asexual reproduction. Which of the following is an disadvantage for asexual reproduction?
Can you read this??
Dndkfrjjdfjjd
Answer:
I can't read the picture because it's too pixelated, but "Dndkfrjjdfjjd"
clearly means "Da National Day Known For ReJoicing Joe's Dad For Joyous Jiving Dogs".
How does Nitrogen get from the atmosphere to the soil?
Answer:
Plants get their nitrogen indirectly from the air via microorganisms in the soil and in certain plant roots.
Answer:
Microorganisms and certain plant roots in the soil
Explanation:
"Plants get the nitrogen that they need from the soil, where it's already been fixed by bacteria and archaea. Bacteria and archaea in the soil and in the roots of some plants have the ability to convert molecular nitrogen from the air (N2) to ammonia (NH3)... Such organisms are called "diazotrophs". From here, various microorganisms convert ammonia to other nitrogen compounds that are easier for plants to use. In this way, plants get their nitrogen indirectly from the air via microorganisms in the soil and in certain plant roots."
I hope this helps...
Homeostasis: Response to Stimuli
From the examples below, select the examples of cells or organisms responding to stimuli in order to maintain homeostasis.
1.)A plant bending toward a light source
2.)A cell bursting because it takes up too much water
3.)A person shivering when their body temperature is low
4.)A unicellular organism beating microscopic hairs to escape a chemical pollutant in its environment
5.)A cell dying due to a chemical poison
6.)An animal growing larger
7.)Ants moving within their mounds depending upon the time of day
8.)Iguanas laying in the sunlight if their body temperature is low
9.)Birds migrating when seasons change
10.)A person or animal getting sick because of infectious bacteria
part2 fill in the blank
A state of biological balance, or ____________ , is important for the survival of individual cells and ____________ alike.
Physiological factors such as ____________ , water levels, and pH must remain within a certain ____________ for cells and organisms to remain healthy and functional.
Regulation of the ____________ environment of cells and organisms is carried out through ____________ and other control ____________ .
choice of words:
location
external
hormones
mechanism
homeostasis
internal
groups
feedback
oganisms
temperature
range
Answer:
3.)A person shivering when their body temperature is low.
7.)Ants moving within their mounds depending upon the time of day
1-A plant bending toward a light source.
.-Iguanas laying in the sunlight if their body temperature is low.
.-A unicellular organism beating microscopic hairs to escape a chemical pollutant in its environment
.-Birds migrating when seasons change.
The maintenance of relatively constant internal environment of an organism is called Homeostasis.It is an automatic regulations of the body systems and organs controlled by the brain and some receptors, specific for certain body fluctuations.E.g Thermoreceptors Chemoreceptors etc.
The fluctuations in the body internal systems must be controlled within a narrow limits, for existence of living organism.The brain receives inputs from the receptors, and the outputs from the brain ensures the homeostatic control.
The above examples are typical homeostatic responses by the organisms involved, because the inputs from the receptors send signals to the brain ,and the organisms responded to these with the example above.
Explanation:
Explain what would happen if the body's kidneys failed?
A. The body will not be able to produce enough blood.
B. The body will not be able get rid of waste products made by cells.
C. The body will not get sufficient amount of clean water.
D. The body will not be able to dispose of carbon dioxide in the blood.
Answer:
b:) the body will not be able to get rid of waste products made by cells
Explanation:
When you are sitting in a bath, are your skin cells in a hypertonic or hypotonic solution?
Answer:
hypotonic
Explanation:
What 3 molecules, bonded
together, create a single link in the DNA chain
Answer:
nucleotides, phosphate, sugar (for a better explanation go to google and that should help you! I hope this helps you)
particles is found in the nucleus of an atom
Answer:
protons and neutrons
Explanation:
Protons and neutrons have a positive and neutral charge, respectively. They are in the nucleus, while the negative electrons orbit the nucleus.
Answer:
Protons, neutrons, electrons
Explanation:
If you're asking about subatomic particles.
1. Does a scientific theory ever become a law? Explain
the difference between scientific theory and law.
Answer:
a theory cannot become a law
Explanation:
the difference between a scientific theory and a scientific law because a theory is an in depth explanation of an observed phenomenon. a law is a statement about an observed phenomenon or an unifying concept (i.e.: newtons law or gravity - no explanation on how it works or what it is just that it exists.)
Plz help I’ll mark brainliest
Answer:
C. The study of the interaction between living and nonliving factors in an environment
Explanation:
Ecology is the study of both living and nonliving things in an environment, the only answer that relates to this in significance is C.
Which of the following is an example of a lipid?
phospholipid.
triglyceride
fats and oils.
all of these
Answer:
phospholipid
Explanation:
Phospholipids, triglycerides, fats, and oils are examples of a lipid. Therefore, option D is correct.
What are lipids?Fatty, waxy, or oily molecules are referred to as lipids. They are soluble in organic solvents but insoluble in polar solvents like water. Steroids, phospholipids, oils, and waxes are examples of lipids. They are usually referred to as fats and oils.
Since lipids may be broken down to provide significant amounts of energy, one of their primary biological purposes is the storage of energy. The structural elements of cell membranes and a number of the body's messengers and signaling molecules are also formed by lipids.
Cell membranes, cholesterol, blood cells, and the brain are just a few places where they can be found in the human body.
Learn more about lipids, here:
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a. What is the major evolutionary advantage to producing an amnion?
b. What does that mean for embryonic development for the animal phylum as compared to the animal phyla?
WHAT IS THE MAJOR EVOLUTIONARY ADVANTAGE TO PRODUCING AN AMNION?
The main evolutionary advantage of producing an amnion is that the embryos of the amniotic membrane,the amniotes are made available with their own aquatic environment,this in-turn resulted to a lesser dependence on water for it's maturation and development therefore allowing or giving room for the amniotes to branch towards environments that are drier.
WHAT FOES THAT MEAN GOR EMBRYONIC DEVELOPMENT OF THE ANIMAL PHYLUM AS COMPARED TO THE ANIMAL PHYLA?
The embryonic development of animal phylum is also known as embryogenesis.
It is the development of the embryo from the point of fertilization of an egg,(the ovum) by a sperm cell ,this makes the fertilized egg a diploid cell otherwise known as a zygote.
This zygote undergoes mitosis,a mitotic division known as cleavage and a differentiation resulting in a multicellular embryo.
This embryonic development of animal phylum comprises of 36 animal phyla.
Which of the three traits considered in this film (bipedality, extensive tool use, and large brains) were present in the 3.2-million-year-old Australopithecus fossil (Lucy)?.
Answer:
The bipedality
Explanation:
One of the things the discovered fossil signified was that human bipedality was more ancient than the large brain size because Lucy actually had a small skull which could indirectly be translated to small brain size.
NOTE: Bipedality can be described to mean the ability of an organism to move about with two legs. Hence, it must have been discovered that Lucy had two legs.
The process of photosynthesis requires the starting materials
Answer:
Carbon Dioxide, Water, and sunlight
Explanation:
Answer:CO2 and H2O
Explanation: