The fur color change in Himalayan rabbits exposed to low temperatures is due to an environmental influence on the action of a temperature-sensitive gene product, with cooler temperatures allowing for pigment production in the extremities.
The fur of a Himalayan rabbit changes color after prolonged exposure to low temperature due to a temperature-sensitive gene product responsible for pigment production. This gene product, an allele for tyrosinase, is active only at lower temperatures, resulting in pigment being produced in the cooler parts of the rabbit's body, such as the ears, nose, and feet. In a cold environment, the extremities are colder, and thus more pigment is produced, leading to darker fur in these areas. Conversely, in warmer body areas or warmer climates, the enzyme is not as effective, and so the fur remains lighter.
Therefore, the change in fur color in the Himalayan rabbit due to low temperatures is most likely due to environmental influence on gene action. The gene is already present in the rabbit's genetic makeup, but its expression is influenced by environmental temperatures. This is why you would see a difference in fur coloration in rabbits living in different climates, such as the arctic versus the tropics.
I need help on this question
Kersten, a 40-year-old woman, found it impossible to stop smoking and using alcohol during her pregnancy. these behaviors increase risk for:
A patient with visual agnosia will probably show an inability to
A patient who suffer visual agnosia will probably show an inability to identify or recognize common objects in a plain view and they cannot interpret visual information. This is due to the damage in anterior cortex like the temporal lobes and posterior occipital of the brain. Additionally, visual agnosia is diagnosed by assessing the patient’s ability to name and describe the use of visually presented objects
What is the minimum pulse ox reading the emt wants to maintain in the patient with spontaneous breathing?
A radioactive tracer has a half life of 2 hours. How much of a 2500 g sample will be available after 24 hours?
A) 2.44 g
B) 1.22 g
C) 0.610 g
D) 0.31 g
Final answer:
Using the concept of half-life, we find that after 24 hours, which is 12 half-lives for a substance with a half-life of 2 hours, a 2500 g sample of a radioactive tracer will decay to 0.610 g.
Explanation:
The student is asking about the amount of a radioactive tracer remaining after a certain period, given its half-life. To calculate this, we apply the concept of half-life, which is the time required for half of the radioactive substance to decay. In this case, the half-life is 2 hours.
After 24 hours, which is 12 half-lives (24 hours ÷ 2 hours per half-life), the amount of substance remaining can be calculated as follows:
After 1 half-life (2 hours): 2500 g ÷ 2 = 1250 g
After 2 half-lives (4 hours): 1250 g ÷ 2 = 625 g
...
After 12 half-lives (24 hours): 2500 g ÷ (2^12) = 2500 g ÷ 4096 = 0.610 g
Therefore, the correct answer to the student's question is C) 0.610 g.
A culture medium on which only gram-positive organisms grow and a yellow halo surrounds staphylococcus aureus colonies is called a(n)
When atp releases some energy, it also releases inorganic phosphate. what happens to the inorganic phosphate in the cell?
When ATP releases energy, inorganic phosphate can be used in various cellular processes such as phosphorylation of other compounds or stored as glycogen.
Explanation:When ATP is broken down, usually by the removal of its terminal phosphate group, energy is released. The energy is used to do work by the cell, usually by the released phosphate binding to another molecule, activating it. For example, in the mechanical work of muscle contraction, ATP supplies the energy to move the contractile muscle proteins. In the case of inorganic phosphate, it can be used in various cellular processes such as phosphorylation of other compounds or stored as glycogen.
What would happen if a cell underwent mitosis, but did not go fully complete cytokinesis?
When a sperm and an egg first unite a single new cell called a ____________ is formed?
Which bathymetric technique differentiates between multiple layers of the ocean bottom?
The bathymetric technique that differentiates between multiple layers of the ocean bottom is seismic reflection.
The seismic reflection can be described as the reflection of elastic waves between the bodies of rock at boundaries. These possess different physical properties. This study or technique is mainly used for research purposes.
Compare and contrast the characteristics of vascular and nonvascular plants
The primary distinction between vascular and nonvascular plants is that vascular arteries transport water and food to all areas of the plant.
How does changing the proteins produced in a cell alter what an organism does?
Final answer:
Changing the proteins produced in a cell can alter what an organism does through modifications to the RNA or protein, as well as mutations in the DNA or RNA.
Explanation:
Changing the proteins produced in a cell can alter what an organism does through various mechanisms. For example, modifications to the RNA or protein can affect the amount, function, and stability of the protein. Mutations in the DNA or RNA can also cause a protein to be made incorrectly, resulting in a loss of protein function. This can be detrimental to the organism as proteins are responsible for orchestrating almost every cell function and influencing most of the traits displayed by multicellular organisms.
Maya's father told her that hummingbirds like to drink the nectar from red flowers. Maya noticed that most of the hummingbird feeders in the store were made of red plastic. She wondered if this were really true. She decided to conduct an experiment to see if hummingbirds really preferred red flowers to other colors. Maya hung three bottles, upside-down, in her garden. One was red, one was green, and the last one was clear. She filled the bottles with the same sugar solution and screwed a drip nozzle into each one. Then she waited and watched. What is the independent variable in this experiment? A) the color of the feeder B) the location of the bottles C) the amount of sugar solution D) how much the hummingbirds ate
Answer:
The color of the birdfeeders
Explanation:
Independent variable is the variable in the experiment that is changed, so the only thing changed in this experiment is the colors of the bird feeders
Answer:
B
Explanation:
the location of the bottles and the sugar solution
Describe the characteristics of two hybrid seeds of the green revolution
Which of the following best describes succession? A. The changes in species composition in a community over time as species colonize and area. B. The evolution of species through natural selection to becomes different species over time. C. All of these are good descriptions of succession. D. The reduction of biodiversity of an ecosystem over time.
Succession is a process which brings change in the composition of species in a community over a period of time. In this process a community undergoes change for the initial colonization of a new habitat. Succession begins with colonization of an area that has not been previously occupied by an ecological community. Succession continues till the climax community occupies that area.
Succession refers to the changes in species composition in a community over time. It can be primary or secondary, commencing with pioneer species in primary succession. The community eventually reaches an equilibrium state.
Explanation:The term 'succession' best describes option A, that is, the changes in species composition in a community over time as species colonize an area. Succession describes the sequential appearance and disappearance of species in a community over time. Two types of succession namely are primary succession and secondary succession. In primary succession, newly exposed or newly formed land is colonized by living things, often starting with pioneer species who have few soil requirements. Secondary succession occurs when part of an ecosystem is disturbed yet remnants of the previous community remain. As succession progresses, communities will gradually reach an equilibrium state, the composition of species within these communities changing over time until a more or less permanent community is established.
Learn more about Succession here:https://brainly.com/question/13015656
#SPJ3
Which human body system includes the lungs, liver, skin and kidneys?
The principal hormone secreted by the corpus luteum, which prepares the uterus for pregnancy,
The corpus luteum, a temporary endocrine structure in females, produces the hormone progesterone which is crucial for maintaining pregnancy.
Explanation:The principal hormone secreted by the corpus luteum, which prepares the uterus for pregnancy, is progesterone. The corpus luteum is a temporary endocrine structure in female ovaries and is involved in the production of relatively high levels of progesterone, necessary to maintain a healthy pregnancy. Once the egg has been released from the follicle during ovulation, the remaining follicular structure is transformed into the corpus luteum. If a pregnancy occurs, the corpus luteum continues to produce progesterone, which helps maintain the pregnancy until the placenta is able to take over this function.
Learn more about corpus luteum here:https://brainly.com/question/34810896
#SPJ6
The duodenum of the small intestine being squirted by bile how it works
Which of these is a behavioral response determined by past experience?
A. sleeping
B. eating
C. hunting in packs
D. All behaviors are learned from past experiences.
like that other person said its c i am totaly not copying you
Rendon has been using xanax for a period of over six months. alex, his friend, asks him to stop using the drug as it adversely affects the body. brendon listens to alex and discontinues taking the drug. however, upon withdrawal, he experiences immense physical pain accompanied by increased craving for the drug. this is most likely due to
The reason of why Brendon experience immense physical pain and increased craving upon withdrawal because of physical dependence. Physical dependence is a physical condition that occurs after a gradual drug withdrawal in which the drug is being chronically used that upon withdrawal, it causes unpleasant symptoms, mainly, physical.
Where does most seismic activity occur?
in the center of tectonic plates
along tectonic plate boundaries
in mountains
deep within the earth
A purebred plant that has yellow flowers is crossed with a purebred plant that has white flowers. All the offspring have yellow flowers. Which conclusion about yellow flowers is supported by these results?
A:Yellow flower color is a dominant trait.
B:Yellow flower color is a recessive trait.
C:Yellow flower color is a hetero-zygous trait.
D:Yellow flower color is a mono-hybrid trait.
Answer: A Yellow flower is a dominant trait.According to Mendel's first law if a cross is made between two different characters then the dominant character will be the character of the offspring formed.Here when a yellow flowered plant is crossed with white flowered plant then the offspring had yellow colored flower because yellow color is a dominant trait.
A).Yellow flower color is a dominant trait is correct answer. This means yellow is expressed in the F1 generation despite the presence of an allele for white flowers.
The most accurate conclusion about yellow flower color is that it is a dominant trait, as supported by the results of crossing a purebred yellow-flowered plant with a purebred white-flowered plant, where all offspring displayed yellow flowers. According to Mendel's Principles of Dominance, a dominant trait will always manifest in the phenotype of the first generation (F1) in a monohybrid cross if it is present. Therefore, option A: Yellow flower color is a dominant trait is correct.
To understand this in detail:
Mendel's experiments showed that crossing two purebred plants, one with a dominant trait and one with a recessive trait, results in F1 generation hybrids that only display the dominant trait.The hidden or latent trait (white flower color in this case) is the recessive trait, which can reappear in subsequent generations if hybrids are crossed among themselves.Hence, the yellow flower color trait dominates and masks the white flower color trait in the F1 generation.
The human body contains roughly 100 trillion cells. approximately what percentage of those cells are independent microorganisms?
Approximately 90% of the cells in the human body are estimated to be independent microorganisms.
These microorganisms, collectively known as the human microbiota, include bacteria, viruses, fungi, and other microbes that reside in and on our bodies. They are primarily found in areas such as the skin, mouth, gastrointestinal tract, and reproductive organs.
The human microbiota plays important roles in digestion, immune function, metabolism, and overall health. It is worth noting that estimates of the exact percentage may vary slightly in different studies, but the general range is around 90%.
More recent research indicates that the number of human cells and microbial cells in the body may be roughly similar, although there is still some variability among individuals it is still challenging to provide an exact percentage.
Hence, we can say that almost 90% of cells are independent microorganism.
Learn more about digestion here:
https://brainly.com/question/29028558
#SPJ6
Final answer:
Approximately 50% of the cells in the human body are independent microorganisms, particularly those in the gut. These microorganisms are vital for digestion, metabolism, and the immune system.
Explanation:
The human body contains over 100 trillion cells, and it is estimated that these cells are outnumbered by bacteria and other microbes by a ratio of approximately 1:1. This means that roughly half of the cells in the human body are independent microorganisms. These microbes, particularly those in the gut, play a crucial role in digestion, metabolism, and the immune system. They have a significant impact on our overall health and well-being.
Insulin is needed to regulate sugar levels in the blood. while every cell in the body contains genes for the production of insulin, it is only produced by a specialized subset of cells in the pancreas. therefore:
A human cell placed into a hypertonic solution is likely to a human cell placed into a hypertonic solution is likely to
In a hypertonic solution, where the concentration of solutes outside the cell is greater than inside, a cell will lose water and shrink. This occurs through the process of osmosis. This contrast with a hypotonic environment where cells absorb water and swell.
Explanation:When a human cell is placed in a hypertonic solution, it is exposed to an external environment where the concentration of solutes is higher than inside the cell. In response to this, the water molecules within the cell will begin to diffuse out of the cell in a process called osmosis to balance the concentration of solutes. This outflow of water causes the cell to lose water and consequently shrink, a process known as plasmolysis.
In contrast, in a hypotonic environment where the concentration of solutes is lesser outside than inside the cell, water molecules move into the cell, causing it to swell. The aim in living systems is to maintain cells in an isotonic solution where the concentration of solutes outside and inside the cell is equal, preventing the cells from either shrinking or swelling.
Learn more about Hypertonic Solution here:https://brainly.com/question/13886457
#SPJ12
The Cretaceous-Tertiary extinction was most likely caused by _____. an asteroid hitting the earth volcanism both a and b none of the above
The correct answer is option A, an asteroid hitting the earth
Reason -
The extinction event of Cretaceous is considered as a mass extinction process in which near about 3/4th of the species on planet earth became extinct. The researches conducted (found in geologic record) to study the cause of this massive extinction event, revealed presence of iridium metal on the Earth crust which is a rare metal and is usually found in the asteroids or comets. Thus, hitting of planet earth by the asteroids or comets can be considered as a cause of this massive extinction.
Steroid hormones enter a cell by simple diffusion. in doing so, these steroids __________.
The answer is D: Do not initiate cell signaling by interacting with a receptor in the plasma membrane. Signaling molecules that are large and cannot diffuse through the pores of the cell membrane are the ones that initiate internal cell signaling cascade by binding to receptors on the cell membrane.
Steroid hormones enter a cell through simple diffusion, binding to intracellular receptors found either in the cytoplasm or within the nucleus. This triggers cell signaling pathways which directly influence gene expression, thereby controlling the levels of protein synthesis in the cell. As a result, steroid hormones can regulate specific cell processes.
Explanation:Steroid hormones, derived from cholesterol, enter a cell through a process known as simple diffusion. These hormones are hydrophobic and are small enough to diffuse across the lipid bilayer of the cell's plasma membrane. Upon entering the cell, steroid hormones bind to intracellular receptors located in the cytoplasm or within the nucleus.
Following this, the hormone-receptor complex triggers cell signaling pathways, which in turn regulate specific genes on the cell's DNA. This hormone-driven gene regulation acts as a transcription regulator, affecting the synthesis of mRNA molecules of certain genes. This process alters gene expression, determining the quantity of corresponding protein that is synthesized within the cell.
The proteins thus synthesized can alter the cell's structural characteristics or enforce the production of enzymes that catalyze chemical reactions. Therefore, steroid hormones can regulate specific cell processes based on the quantity and functionality of the proteins they influence.
Learn more about Steroid Hormones here:https://brainly.com/question/32153048
#SPJ12
Women who wish to become pregnant should have sexual intercourse after a surge in: women who wish to become pregnant should have sexual intercourse after a surge in: luteinizing hormone (lh). progesterone. follicle-stimulating hormone (fsh). androgens.
are foxes asexual or sexual?
a fox can have either genders from male to female. they are not asexual.
Hope this helps!
-Payshence xoxo
A client with a history of opiate abuse asks the nurse, "why do i crave this stuff so much?" the nurse responds, knowing that the client's craving is a result of which factor?
Final answer:
The craving the client experiences is likely a result of psychological dependence on opiates, where the brain's reward system has been altered to create intense cravings. The development of tolerance and the use of rehabilitation methods including psychotherapy and medication can assist in overcoming addiction.
Explanation:
The client's craving for opiates is likely due to psychological dependence, which is an emotional, rather than physical, need for a drug. Clients with a history of opiate abuse develop this dependence because these drugs alter the brain's reward system, leading to intense drug cravings. To answer the client's question, the nurse should explain that craving opioids is a common effect of the psychological dependence that can develop after repeated use, and even after the physical withdrawal symptoms have resolved.
Over time, a person who uses opioids may develop tolerance, meaning they need higher doses of the drug to achieve the same effect, which further exacerbates the cycle of dependence and addiction. Withdrawal symptoms from opioids can include not only physical discomfort but also psychological distress like anxiety and depression. To treat addiction, rehabilitation may involve psychotherapy, support groups, and sometimes medications like methadone to help manage cravings and withdrawal symptoms.