generally, only which type of hair contains a medulla?
Answers
Generally, only human hair contains a medulla.
The medulla is the innermost layer of the hair shaft and is found in certain types of human hair. It is not present in the hair of all individuals or in all types of hair. The presence of the medulla can vary depending on various factors such as hair thickness, ethnicity, and individual genetics.
The medulla is a soft, spongy region within the hair shaft that contains cells and air spaces. Its function and purpose are not fully understood, and it may serve different roles depending on the species and type of hair.
In human hair, the medulla is often absent or not well-developed in fine or thin hair types, such as those with a diameter of less than 60 micrometers. On the other hand, coarse hair types, such as those with a diameter greater than 80 micrometers, are more likely to have a visible medulla.
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Related Questions
. The variations that exist in a population of wild giraffes are usually a result of events that occur during
Answers
Answer: sexual reproduction
explain how competition can affect an organisms niche
Answers
Answer:
The competitive exclusion principle says that two species can't coexist if they occupy exactly the same niche (competing for identical resources). Two species whose niches overlap may evolve by natural selection to have more distinct niches, resulting in resource partitioning.
Competition influences an organism's niche by shaping its resource utilization, spatial distribution, and evolutionary adaptations. It drives species to adapt and specialize, facilitating coexistence and maintaining the balance of ecological communities.
Competition plays a significant role in shaping an organism's niche, which refers to the specific role and position it occupies within its environment. Here's how competition can affect an organism's niche:
Resource Competition: Organisms often compete for limited resources such as food, water, shelter, or mates. When resources are scarce, intense competition can occur, forcing organisms to adapt their niche to gain access to these resources. This can lead to specialization, where organisms develop specific traits or behaviors to exploit specific resources and reduce competition.Competitive Exclusion: Intense competition can result in competitive exclusion, where one species outcompetes another for the same resources. This can lead to the displacement or elimination of the less competitive species from that particular niche. As a result, the winning species can expand its niche and occupy a broader range of resources.Niche Partitioning: In order to coexist and reduce competition, similar species may partition their niches by dividing the available resources. Each species may specialize in utilizing different resources or occupy different microhabitats within the same ecosystem. This allows for the coexistence of multiple species with similar requirements.Competitive Interactions: Competition can also drive evolutionary changes in organisms. Over time, species may evolve different traits or behaviors that give them a competitive advantage in accessing resources or avoiding competition. This can lead to the diversification of niches within a community, as species adapt to occupy different ecological roles.Learn more about Competition, here:
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An enzyme is added to a cell that degrades the snares in all the membranes. A vesicle leaving the ER will:
A. dock with but not fuse with the target membrane.
B. fuse with the first membrane with which it comes in contact.
C. not recognize nor fuse with any membrane.
D. not occur because the vesicle will not be able to form.
Explain the reasoning by which you arrived at your answer to the question.
Answers
An enzyme is added to a cell that degrades the snares in all the membranes. A vesicle leaving the ER will not recognize nor fuse with any membrane . Therefore, option (C) is the correct answer.
What are snares?SNARE proteins, which are part of a larger protein complex, are membrane-anchored proteins involved in intracellular vesicle transport. Snares are a group of protein molecules that aid in the docking and fusion of vesicles with their target membranes. They are present in the membranes of the vesicles and target organelles. When a vesicle connects with its target membrane, the SNARE complex aids in the fusion of the vesicle with the membrane.
SNAREs are a crucial component of intracellular transport, ensuring that the contents of vesicles are delivered to their intended target. What are vesicles?Vesicles are tiny, membrane-bound structures that can transport molecules between different cell organelles and the cell membrane. They're created by the cell's endoplasmic reticulum (ER) and then shipped to their destination. Vesicles play a crucial role in the transport of materials inside the cell.
The enzyme that destroys all snares in all membranes will interfere with the SNARE complex's function, preventing vesicles from docking with the target membrane. The vesicles will not be able to recognize or combine with any membrane as a result of this.
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help will give brainlist
Answers
Answer:
Tapeworm and human.
If a windbreak can reduce the speed of wind for distances up to 30 times the height of the trees, how far would theses trees reduce the wind speed if the trees are 17m high)
A. 47m
B. 51m
C. 470m
D. 510m
Answers
Answer:
a
Explanation:
im smart and i know it
One trait of scientific knowledge is that it is acquired by a?
Answers
One characteristic of scientific knowledge is that it is attained through an impartial procedure in which the scientist's emotions and opinions are not permitted.
What characteristics are scientific?Observation, curiosity, rationality, inventiveness, skepticism, objectivity, and peer review are qualities or aspects of a scientist that contribute to their success. Regardless of their area, these qualities are crucial for all scientists.
Why are character qualities significant in science?Researchers and medical professionals are curious about why some people exhibit particular qualities while others do not, especially when those traits provide information on the causes and course of sickness. When a person demonstrates several distinct characteristics, this may provide us with hints as to how to identify a medical issue.
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The scientists are planning an experiment using a light microscope to collect data. Which statement BEST describes how the scientists can identify nonliving samples?
Group of answer choices
The scientists should look for samples that do not have a regular pattern of shapes when viewed under the microscope.
The scientists should look for samples that have objects that look bigger when viewed under the microscope.
The scientists should look for samples that do not have a nucleus or cell membrane when viewed under the microscope.
The scientists should look for samples that have carbon atoms when viewed under the microscope.
Answers
Answer:
The scientists should look for samples that do not have a nucleus or cell membrane when viewed under the microscope.
Explanation:
A cell can be defined as the fundamental or basic functional, structural and smallest unit of life for all living organisms. Some living organisms are unicellular while others are multicellular in nature.
A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells.
In a cell, the "workers" that perform various functions or tasks for the survival of the living organism are referred to as organelles. Some examples of cell organelles with their respective functions in all living organisms such as trees, birds, and bacteria include; nucleus, cytoplasm, cell membrane, golgi apparatus, mitochondria, lysosomes, ribosomes, chromosomes, endoplasmic reticulum, vesicles, etc.
Generally, all nonliving organisms or things do not have life or cells in them and as such are devoid of cell organelles.
In this scenario, the scientists are planning an experiment using a light microscope to collect data. Thus, the statement which best describes how the scientists can identify nonliving samples is that, the scientists should look for samples that do not have a nucleus or cell membrane when viewed under the microscope.
Answer:
Scientists should look for samples that do not have a nucleus or cell membrane when viewed under the microscope.
Explanation:
proved that unpolished rice responsible for beriberi.
Answers
The absence of thiamin, or vitamin B1, is one of the causes of beriberi.
What food causes beriberi?According to the National Institutes of Health, beriberi is most prevalent in areas of the world where people consume unenriched, processed white rice, which has a tenth as much thiamine as brown rice.Thiamine deficiency is the cause of the illness beriberi (vitamin B1).In the dry form of beriberi, the long nerves gradually deteriorate, first in the legs and subsequently in the arms, along with muscular atrophy and reflex loss.Most often, alcoholics and those who only consume white rice or other highly refined carbohydrates are at risk for thiamin deficiency, which causes beriberi. Diffuse polyneuropathy, high-output heart failure, and Wernicke-Korsakoff syndrome are among the symptoms.Proved that unpolished rice is responsible for beriberi:
One of the contributing factors to beriberi is the lack of vitamin B1 or thiamin. Asians consumed polished rice (without nutrient-rich bran or germ) during this time. Christiaan Eijkman, a Dutch physician, and pathologist discovered that feeding unpolished rice to chickens helped prevent beriberi.
Therefore, feeding unpolished rice to chickens helped prevent beriberi.
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What are three types of sedimentary rocks? How do they form?
Pls give a legit answer thats not off of google for brainly, thank you.
Answers
Answer:
Three types of sedimentary rocks are, clastic, organic (biological), and chemical. Clastic rocks are formed by made up of pieces (clasts) of pre-existing rocks. Organic rocks are formed by accumulation and lithification of organic debris, such as leaves, roots, and other plant or animal material. Last but not least chemical rocks are formed by precipitation of minerals from water. Precipitation is when dissolved materials come out of water.
These finches have a common ancestor and live close to each other on different islands. Why are their beaks different? *
Answers
Answer:They live in different environments and to survive many finches have different beaks.
Explanation:
Which of the following is an example of a non-contact force?
1.the force of a spring board on a diver
2.the force of a table on a book
3.the force of gravity on a falling ball
4.the force of pushing a stroller
please answer this soon! ^^
Answers
Answer:
2.the force of a table on a book
Explanation:
How did Kepler’s discoveries contribute to astronomy?
They supported the heliocentric model.
They established the laws of planetary motion.
They explained how the Sun rises and sets.
They made astronomy accessible to people who spoke Italian.
Answers
Answer:
B
Explanation:
How did Kepler’s discoveries contribute to astronomy?
They supported the heliocentric model.
They established the laws of planetary motion.
They explained how the Sun rises and sets.
They made astronomy accessible to people who spoke Italian.
Snakes have no legs, but some snakes have small bones near the tail. These bones have no function in the snakes life. Explain how the presence of these bones could support the theory of evolution.
Answers
Snakes have no legs, but some snakes have small bones near the tail. These bones have no function in the snakes life. These bones are the example of vestigial organs.
What is the theory of evolution?Evolution is the process of change in all the forms of life over a period of generations. Biological populations have evolved through genetic changes over time which corresponds to changes in the organisms' observable traits.
Vestigial organs are the evidence of theory of evolution. Vestigial organs are the organs which have no apparent function and appear to be residual parts from a past ancestor however, there presence could lead to problem in certain cases.
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How does muscle use sugar in resting state vs. working out?
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In resting state, muscles primarily use stored glycogen and fats as sources of energy. During this time, the rate of glucose uptake and metabolism by the muscles is relatively low.
The body is able to maintain its energy requirements by metabolizing fats, which are stored in adipose tissue, and glycogen, which is stored in muscle and liver tissue.
During exercise or physical activity, however, the energy requirements of the muscles increase, and the rate of glucose uptake and metabolism by the muscles increases accordingly. This is because glucose is the preferred source of energy for muscle cells during high-intensity activity, such as running or weightlifting.
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stomata, plant cell biologist yuree lee, lipid molecules, phosphatidylinositol phosphates, guard cells, which choice completes the text so that it conforms to the conventions of standard english?,
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The complete text about "stomata, plant cell biologist Yuree Lee, lipid molecules, phosphatidylinositol phosphates, guard cells" conforms to the conventions of standard English is
"Stomata, tiny pore structures in a leaf that absorb gases needed for plant growth, open when guard cells surrounding each pore swell with water. In a pivotal 2007 article, plant cell biologist Yuree Lee showed that lipid molecules called phosphatidylinositol phosphates are responsible for signaling guard cells to open stomata". (Option C).
The convention being tested is the use of punctuаtion between titles аnd proper nouns. No punctuаtion is needed to set off the proper noun “Yuree Lee” from the title thаt describes Lee, “plаnt cell biologist.” Becаuse “Yuree Lee” is essentiаl informаtion identifying the “plаnt cell biologist,” no punctuаtion is necessаry.
Choice А is incorrect becаuse no punctuаtion is needed. Choice B is incorrect becаuse no punctuаtion is needed. Choice D is incorrect becаuse no punctuаtion is needed before or аfter the proper noun “Yuree Lee.” Setting the biologist’s nаme off with commаs suggests thаt it could be removed without аffecting the coherence of the sentence, which isn’t the cаse.
Your question is incomplete, but most probably your full question was
Stomata, tiny pore structures in a leaf that absorb gases needed for plant growth, open when guard cells surrounding each pore swell with water. In a pivotal 2007 article, plant cell ______ showed that lipid molecules called phosphatidylinositol phosphates are responsible for signaling guard cells to open stomata.
Which choice completes the text so that it conforms to the conventions of Standard English?
A) biologist, Yuree Lee
B) biologist Yuree Lee,
C) biologist Yuree Lee
D) biologist, Yuree Lee,
Thus, the correct option is C.
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How does paving and concreting areas affect watersheds?
Answers
Answer:
As the amount of impervious paved surfaces increase, watersheds become more vulnerable to pollutants. When rains fall on a conventionally paved impervious surface, the precipitation is generally directed down storm drains, which can result in flooding and overwhelming the storm water management system.
Explanation:
can someone help me with this immediately!!!! pls don’t guess or leave links!! correct answer gets brainiest
Answers
Answer:
Bones produce blood cells. So, if there are no bones in our body, then our body cannot make blood. So the answer is B.
How many copies of a recessive allele are needed for that trait to show up?
Answers
For a recessive allele to manifest, two copies of it must exist.
A recessive phenotype can only be caused by two copies of a recessive allele, one from each parent. An individual with the dominant phenotype will have one dominant allele and one recessive allele for a given gene. A particular gene will only be expressed in an organism if it has two recessive alleles.
One copy of the dominant allele is all that is required for the manifestation of a dominant trait. The effects of the other allele are hidden by the dominant allele. An individual with two copies of a dominant allele often exhibits the same phenotype as an individual with only one copy.
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How dose the overfishing of bass impact co2 entering the lake from the atmosphere
Answers
Answer:
Changing with the climate
Fish make calcium carbonate by combining calcium from seawater with carbonate ions generated from CO2 in their bodies. If the amount of atmospheric CO2 goes up as expected leading to a CO2 increase in the oceans the fish may produce more carbonate ions and thus more calcium carbonate.
Explanation:
motor units are activated on a rotating basis to reduce fatigue. what is this mechanism called?
Answers
The mechanism by which motor units are activated on a rotating basis to reduce fatigue is called motor unit recruitment.
The nervous system recruits motor units in a specific order based on the size and type of the motor units. Smaller motor units are recruited first, which have less force but greater endurance, and larger motor units are recruited later, which have more force but less endurance. This rotating recruitment pattern allows for the muscle fibers within a muscle to be activated in a coordinated manner, preventing fatigue of any one motor unit or group of motor units. By utilizing this mechanism, muscles can continue to contract for extended periods of time without becoming fatigued.
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Use the drop-down menus to identify the organelles labeled on the animal cell to the right.
Label A
Label B
Label C
Label D
The parts of an animal cell are labeled. Part A is shaped like a bean with folds inside. Part B is the center of the cell. Part C is a small circle floating in the cell. Part D is the outside layer of the nucleus
Answers
Label A corresponds to the mitochondria, which is the powerhouse of the cell responsible for generating ATP energy through cellular respiration. Label B corresponds to the nucleus, which contains the cell's genetic material and controls cellular functions.
Since I cannot see the actual image or use drop-down menus, I will provide you with the descriptions and functions of the organelles based on your given descriptions.
Label A: This bean-shaped organelle with folds inside is likely the mitochondrion. The mitochondrion is responsible for producing energy (ATP) through cellular respiration.
Label B: The center of the cell is typically the nucleus. The nucleus contains genetic material (DNA) and controls the cell's activities by regulating gene expression.
Label C: A small circle floating in the cell might be a lysosome. Lysosomes contain enzymes that break down waste materials and cellular debris.
Label D: The outside layer of the nucleus is called the nuclear envelope. It is a double membrane that surrounds and protects the nucleus, controlling the passage of substances in and out of the nucleus.
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Which feature of cycads distinguishes them from most other gymnosperms? 1. They have exposed ovules. 2. They have flagellated sperm. 3. They are pollinated by animals. A) 1 only B) 2 only C) 3 only D) 2 and 3
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The feature of cycads that distinguishes them from most other gymnosperms are they have flagellated sperm and they are pollinated by animals.
option D
What are Gymnosperms?
Gymnosperms are a group of seed-producing plants that includes conifers, cycads, and others. Unlike angiosperms, which produce seeds enclosed in a fruit, gymnosperms produce seeds that are not enclosed in an ovary.
Cycads are a group of gymnosperms that are particularly distinct from other gymnosperms in a few ways. One of these is their flagellated sperm. Most other gymnosperms, such as conifers, have non-motile sperm that are carried to the egg by wind or gravity. Cycads, on the other hand, have sperm with long, flagella-like tails that enable them to swim to the egg. This requires a film of water, which is why cycads are typically found in habitats with high humidity or near bodies of water.
Based on the given options, Cycads are distinguished from most other gymnosperms by having flagellated sperm, which require a film of water to swim to the egg for fertilization. They are also pollinated by animals, such as beetles and moths, rather than by wind or self-pollination. However, like other gymnosperms, they do have exposed ovules.
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hich of the following statements regarding the sanger method is incorrect? group of answer choices the ratio of ddntp to dntp added is approximately 1 to 50. traditionally, the fragments from each of the four reaction tube representing the four different nucleotides are separated on a denaturing polyacrylamide gel for visualization. the ddntps used for premature dna termination have a hydrogen in the 3' position. the sequence is read from the bottom of the gel as the smallest fragment carries the first terminated nucleotide. the ingredients needed for the reaction tubes include the dna template, primers, dntps, ddntps, and rna polymerase.
Answers
The statement "the ingredients needed for the reaction tubes include the DNA template, primers, dNTPs, ddNTPs, and RNA polymerase" is incorrect.
Define the term ddNTPs and DNA polymerase?The ddNTPs (dideoxynucleotide triphosphates) are modified versions of the normal nucleotides (dNTPs) used in DNA replication and sequencing.
The Sanger method, also known as the chain termination method, is a DNA sequencing technique that uses ddNTPs (dideoxynucleotide triphosphates) to terminate DNA synthesis. The correct ingredients needed for the reaction tubes are the DNA template, primers, dNTPs, ddNTPs, and DNA polymerase (not RNA polymerase).
Therefore, the statement "the ingredients needed for the reaction tubes include the DNA template, primers, dNTPs, ddNTPs, and RNA polymerase" is incorrect.
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Rank the following energy changes for a protein molecule in expected size from
smallest to largest. (a) Reorientation of the spin of an unpaired electron of its heme group in a
strong magnetic field (say, 10' gauss).
(b) Formation of the molecule from separated nuclei and electrons. (e) Reorientation of one of its proton spins in a strong magnetic field (say, 10*
gauss).
(d) Formation of the molecule from separated atoms. (e) Reorientation of the dipolar protein (p - 10° D) in an alternating electric
feld of 30 volt cm-'.
(6 Excitation of the vibration of one of its C 0 groups.
(g) Excitation of one of the m electrons in one of its tyrosyl residues.
Answers
The order of energy changes from smallest to largest is
(a) Reorientation of the spin of an unpaired electron of its heme group in a strong magnetic field (say, 10^7 gauss).
(c) Reorientation of one of its proton spins in a strong magnetic field (say, 10^7 gauss).
(e) Reorientation of the dipolar protein (p - 10^8 D) in an alternating electric field of 30 volt cm^-1.
(g) Excitation of one of the π electrons in one of its tyrosyl residues.
(f) Excitation of the vibration of one of its C=O groups.
(d) Formation of the molecule from separated atoms.
(b) Formation of the molecule from separated nuclei and electrons.
What guides the order of energy changes from smallest to largest?The order of energy changes from smallest to largest is known to follow the nature of the interaction, from small changes in orientation to large-scale structural formation.
The smallest energy changes are usually associated with reorientation of spins (electron or proton) in a magnetic field.
The larger energy change is the reorientation of the molecule in an electric field.
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a key factor in the initiation of cap-dependent translation is the availability of eif4e to participate in the eif4f initiation complex through binding 5’ mrna caps and recruitment of eif4a and eif4g
Answers
A crucial element in initiating cap-dependent translation is the accessibility of eIF4E, which binds to 5' mRNA caps and helps in the eIF4F initiation complex by recruiting eIF4A and eIF4G.
There are several initiation factors in cap-dependent translation, with the eIF4F complex playing a key role. eIF4E, a subunit of eIF4F, binds to the 5' end of the mRNA cap, and then eIF4G and eIF4A are recruited to the mRNA. eIF4G interacts with eIF4E to stabilize the binding of eIF4F to the mRNA cap.
eIF4A is an RNA helicase, which unwinds RNA secondary structures during translation initiation, while eIF4G is a scaffold protein that interacts with other initiation factors and binds to the ribosome. Therefore, the availability of eIF4E is a crucial determinant of cap-dependent translation initiation.
Cap-dependent translation is a process that is dependent on the availability of several initiation factors, with the eIF4F complex playing a central role. The eIF4F complex includes eIF4E, eIF4G, and eIF4A, which together with other initiation factors, are recruited to the 5' end of the mRNA.
eIF4E binds to the 5' end of the mRNA cap, and then eIF4G and eIF4A are recruited to the mRNA. eIF4G interacts with eIF4E to stabilize the binding of eIF4F to the mRNA cap, and eIF4A is an RNA helicase that unwinds RNA secondary structures during translation initiation. eIF4G is a scaffold protein that interacts with other initiation factors and binds to the ribosome.
The availability of eIF4E is a crucial determinant of cap-dependent translation initiation. Several signaling pathways regulate the availability of eIF4E, including the mTORC1 signaling pathway, which phosphorylates 4EBP1, leading to its dissociation from eIF4E and allowing eIF4E to participate in the eIF4F complex.
Overall, the initiation of cap-dependent translation is a complex process that is dependent on the availability and interaction of several initiation factors, with eIF4E playing a central role.
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Need the answer quiz please thx
Answers
Answer:
Last option D
Explanation:
It is a recessive disorder, so both alleles are needed to be affected.
Select ALL of the following physical adaptations that plants found in
a desert biome have developed to survive in this type of biome?
large, broad leaves where water is evaporated quickly into the air
thick, waxy skin to hold in water
a shallow root system to soak up water quickly before it's evaporated
no leaves or have spines to prevent water loss
Answers
Answer:
b) thick, waxy skin to hold in water
c) a shallow root system to soak up water quickly before it's evaporated
d) no leaves or have spines to prevent water loss
Those three answers should all be right.
Yoireceived a gatent withtead onicily Which of the following sites if the lead present in will exhibit tis toxic effect? Selectone: a. Spleen b. Bone c. Soft tissue d. Liver
Answers
The given terms of the question are: You received a gateau with lead on it. Which of the following sites if the lead present in will exhibit this toxic effect?
The toxic effect of lead is most likely to be seen in the liver.
Lead is a toxic substance that can be harmful to our bodies. It can cause severe damage to many organs, including the liver, spleen, brain, kidneys, and bones, among others. However, out of all the mentioned sites, the liver is the most likely site to exhibit a toxic effect from the presence of lead. The reason behind this is that the liver is the primary organ responsible for metabolizing and removing toxins from the body, including lead. Therefore, if there is a large amount of lead present in the body, the liver will have to work harder to detoxify the body, which can lead to liver damage. Hence, the correct answer is option D) Liver.
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The element copper has 29 protons. What is the atomic number of copper?
Answers
All cells come from other cells. New cells are created by a process called cell division. To start cell division, a cell grows bigger and makes copies of the parts inside it. Then, the cell and its parts separate into two new cells. Each new cell contains the same types of cell parts as the original cell. Later, each of these cells may divide again to form more cells. When a multicellular organism's cells divide, the organism can grow. Each resulting cell is part of that organism. When a unicellular organism divides, each resulting cell is a separate unicellular organism. The micrographs below show cells from two different organisms: Giardia, a unicellular protist, and banana, a multicellular plant. Giardia cells in a banana Which of the following statements are true? Select all that apply.?
a. A rose bush cell can divide to form two rose bushes
b. If the bacterium divides, it will become a multicellular organism
c. When a rose bush cell divides, it copies its parts then divides into two cells
d. The bacterium was formed when another bacterium divided
Answers
Answer:
c. When a rose bush cell divides, it copies its parts then divides into two cells and
d. The bacterium was formed when another bacterium divided
Explanation:
C is correct because the cells inside are part of a larger being (the rose bush), when they divide they are simply creating more cells (hence making the rose bush grow).
D is correct because bacterium are unicellular organisms, meaning they are themselves single cells that are organisms, unlike the rose bush consisting of many cells.
Please rate this answer choice 5 stars and leave a thanks.