Indicate which three statements are true regarding homeostatic mechanisms.
a. They maintain the concentration of water, nutrients and oxygen within narrow limits
b. They mostly work through positive feedback mechanisms
c. They help maintain a relatively stable external environment
d. They allow an organism to survive
e. They help regulate body temperature and blood pressure
Answers
They maintain the concentration of water, nutrients and oxygen within narrow limits is the true statement regarding homeostatic mechanisms. Statement A, D and E are correct.
The body must constantly check its internal conditions in order to maintain homeostasis. Each physiological situation has a certain set point, including body temperature, blood pressure, and the quantities of particular nutrients. The physiological value that the normal range varies around is known as a set point.
The kidneys control water intake and excretion to maintain water balance. The former is accomplished through thirst sensations that spur water intake, whilst the latter is controlled by vasopressin's antidiuretic effects.
Maintaining the established internal environment in the face of potential balance-disrupting external stimuli is the goal of homeostasis.
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Of the five statements given, the three that are true regarding homeostatic mechanisms are:
a. They maintain the concentration of water, nutrients and oxygen within narrow limits
c. They help maintain a relatively stable external environment
e. They help regulate body temperature and blood pressure
To explain further, homeostatic mechanisms refer to the various processes and systems within an organism that work together to maintain a relatively stable internal environment despite changes in the external environment. These mechanisms help keep things like nutrient and oxygen levels, body temperature, and blood pressure within a narrow range that is optimal for the organism's survival and function. Positive feedback mechanisms, on the other hand, tend to amplify changes and move the system away from its steady state, whereas homeostatic mechanisms work to counteract changes and bring the system back to equilibrium. Ultimately, homeostatic mechanisms are crucial for allowing organisms to survive and function in a constantly changing environment.
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Related Questions
Evidence to why cetaceans closest living relative is the hippopotamus
Answers
The closest living relatives of the hippopotamus are cetaceans (whales, dolphins, porpoises, etc. ), from which they diverged about 55 million years ago.
Hippopotamus and whales may look different in so many ways, but they are actually each others' closest living relatives, sharing a common ancestor that lived about 55 million years ago. Despite their physical resemblance to pigs and other terrestrial even-toed ungulates, the closest living relatives of the hippopotamoids are cetaceans.
All cetaceans, including whales, dolphins, and porpoises, are descendants of land-living mammals. Cetaceans evolved from a group of mammals that include hoofed or “even-toed” ungulates such as cattle, deer, and sheep. The hippopotamus is the closest living ancestor to the cetacean group.
Whales and hippos share several adaptations to life in an aquatic environment, including oil-producing skin glands, the lack of hair, and the use of underwater vocalizations for communication.
Comparison of even-toed ungulate and cetaceans genetic material has shown that the closest living relatives of whales and hippopotamuses is the paraphyletic group Artiodactyl. Studies have suggested that the order Cetacea (whales, dolphins, and porpoises) might be more closely related to the order Artiodactyl.
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Why people get cholera in our community
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Answer:
Search Results
Featured snippet from the web
A person can get cholera by drinking water or eating food contaminated with cholera bacteria. In an epidemic, the source of the contamination is usually the feces of an infected person that contaminates water or food. The disease can spread rapidly in areas with inadequate treatment of sewage and drinking water.
Explanation:
The mode of transmission of Cholera is through fecal contamination of food or water. Transmission is therefore closely associated to poor environmental management due water and sanitation issues
Can an enzyme be recycled? Explain.
Answers
Answer:
Enzymes serve as catalysts to many biological processes, and so they are not used up in reactions and they may be recovered and reused. However, in a laboratory setting, reactions involving enzymes can leave the enzyme unrecoverable. This process makes the enzyme at once less reactive but more stable.
Consider the genome of this retrovirus. Once expressed, how many unique viral RNAs would you find in the cytoplasm?Choose one:A. 11B. 1C. 3D. 0E. 9
Answers
, the number of unique viral RNAs that would be found in the cytoplasm of a retrovirus-infected cell can vary depending on various factors such as the specific retrovirus genome structure and the stage of the viral life cycle.
During the replication cycle of a retrovirus, the viral RNA genome is reverse transcribed into DNA by the viral enzyme reverse transcriptase, and the resulting DNA is integrated into the host genome. The integrated DNA can then be transcribed and translated to produce new viral particles.
Thus, the number of unique viral RNAs that would be found in the cytoplasm of a retrovirus-infected cell would depend on the specific retrovirus genome structure and the number of distinct viral genes that are transcribed and translated. In general, retroviruses can have multiple genes that are expressed as separate viral RNAs, such as the gag, pol, and env genes in the HIV genome.
Therefore, without specific information about the retrovirus genome being referred to, it is not possible to accurately determine the number of unique viral RNAs that would be found in the cytoplasm.
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is it possible for two organisms to have different phenotypes but the same genotype
Answers
Answer: NO
Explanation:
If two individuals have a certain phenotype, it does not mean that they must have the same genotype. Overall, different genotypes can result in the same phenotypes.
What four characteristics of an aquatic environment might make photosynthesis or life processes difficult for aquatic plants? List each characteristic, and describe how it can impact photosynthesis and the plant as a whole. (8 points)
Answers
Answer:
Hello there, I will give the answer
Explanation:
Aquatic plants require special adaptations for living submerged in water, or at the water's surface. The most common adaptation is the presence of lightweight internal packing cells, aerenchyma, but floating leaves and finely dissected leaves are also common.
Muscle cells make up muscle tissues, which are attached to each other and to bones. The main function of muscle cells is to move body parts and organs. They do this by contracting and relaxing, which changes the length and shape of the cells. This process uses several proteins and requires a lot of energy.
Which is the best prediction about the cell structures of muscle cells?
A.
Muscle cells have a large volume of cytoplasm so that the cell can easily change shape.
B.
Muscle cells contain a large number of mitochondria in order to provide more energy.
C.
Muscle cells do not have nuclei because they do not need to produce proteins.
Answers
Reptiles lay eggs as a means of reproducing, while mammals give birth to live young.
Which statement best demonstrates a reproductive disadvantage of mammals?
O The long development time can be risky for both the embryo and the mother.
O The embryo may be exposed to predators.
O The embryo is protected in the mother, and when it is born, it is usually well developed.
O The offspring are born full size.
Answers
Answer:
The long development time can be risky for both the embryo and the mother.
Explanation: The long development time can be risky for both the embryo and the mother.
Cancerous cells sometimes have odd numbers of chromosomes. What checkpoint did those cells bypass/ignore?
a. None of the above
b. The G1 Checkpoint
c. The G2 Checkpoint
d. The M Checkpoint
Answers
Answer:
d
Explanation:
Why do you need to prepare dilutions of the stock solution?
Answers
It is important to prepare dilutions of a stock solution for several reasons:
Accuracy: Dilutions allow for more accurate measurements of a solution. When dealing with very small amounts of a substance, it can be difficult to measure out the exact amount needed. By diluting a stock solution, you can more accurately measure the amount of substance you need.Safety: Some substances can be harmful or dangerous in their concentrated form. Diluting a stock solution can reduce the risk of harm and make it safer to handle.Convenience: Preparing dilutions of a stock solution allows you to create multiple concentrations of the same substance without having to measure out small amounts of the substance each time. This can save time and effort in the long run.Overall, preparing dilutions of a stock solutionis an important step in many scientific experiments and procedures, as it allows for more accurate, safe, and convenient handling of substances.
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What is the book "microbiology with diseases by body system 5th edition" discussing?
Answers
"Microbiology with Diseases by Body System, 5th Edition" is likely a textbook that is used in a course on microbiology, with an emphasis on the relationship between microorganisms and human disease.
The book likely covers the basic biology of microorganisms, including bacteria, viruses, fungi, and protozoa, and their role in causing infections in different body systems. The text may be organized by body system, with chapters devoted to specific diseases caused by microorganisms in the skin, respiratory, cardiovascular, digestive, urinary and reproductive systems, as well as the nervous system. The book is likely to include information on how microorganisms cause infections, how they are transmitted, and how they are diagnosed, treated, and prevented.
The fifth edition of the book probably includes updates and new information on recent advances in the field of microbiology, such as new organisms, new diseases, new diagnostic methods, and new treatments. It may also include new information on the epidemiology of diseases, the mechanism of pathogenesis, and the host response to infection. It may also have new sections on emerging and re-emerging diseases, the role of microbes in chronic diseases, and the impact of antibiotics on human health and the environment. Additionally, the book may include new pedagogical tools such as case studies, problem-based learning, or interactive multimedia that will help students to understand the material and apply it to real-world scenarios.
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List 2 examples of how bacteria are necessary for other species to exist.
Answers
Bacteria are necessary for other species to exist.
1. Helps in breaking down food- there are certain species of bacteria that reside in the gut of animals which helps in maintaining the conditions necessary for digesting food.
2. Fix atmospheric nitrogen- some bacteria live on the root nodules of specific plants that help in the nitrogen fixation which can be absorbed by the plants that act as a fertilizer.
Although A Long Way Gone by Ishmael Beah is a __________, it uses many elements of __________.
biography . . . fiction
memoir . . . fiction
tall tale . . . nonfiction
poem . . . nonfiction
Answers
Although A Long Way Gone by Ishmael Beah is a memoir, it uses many elements of fiction.
What is a memoir?Memoir is a type of literary genre that constitutes a personal narrative and its most significant feature is the insertion of the writer himself as the main character.
Writing an memoir implies a literary pact and not a historical or documentary one, because sometimes the narrative presents a memorialistic rescue (based on reality) and sometimes it builds the plot with the threads of fiction.
So, in this case, A Long Way Gone by Ishmael Beah is a memoir, it uses many elements of fiction.
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The population in a 50 miles^2 area is 200, 000 people, What is the population density? Show your work.
Answers
Answer:
4000
Explanation:
divide the TOTAL population by the AREA
so 200,000/50 which is 4000
Sometimes a base substitution mutation results in the synthesis of the same protein.
Predict what would be the function of the protein if the mutated gene coded for the same
amino acid sequence?
Answers
If a base substitution mutation occurs in a gene but still codes for the same amino acid sequence, it is known as a silent mutation.
In this case, the function of the protein is expected to remain unchanged. This is because the genetic code is degenerate, meaning that multiple codons can code for the same amino acid.
During protein synthesis, the sequence of nucleotides in the gene is transcribed into a messenger RNA (mRNA) molecule, which is then translated into a protein.
Each set of three nucleotides, called a codon, corresponds to a specific amino acid.
There are multiple codons that can code for the same amino acid due to redundancy in the genetic code.
If a base substitution mutation occurs in a codon, but the resulting codon still codes for the same amino acid, the protein's primary structure remains unchanged.
Since the function of a protein is determined primarily by its three-dimensional structure, a silent mutation is not expected to significantly alter the protein's function.
However, it is important to note that some mutations, even if they do not change the amino acid sequence, can affect other aspects of gene regulation or protein production.
These effects may impact protein expression levels, protein folding, or protein interactions, which could indirectly influence protein function.
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What type of mutation is caused by a change in the nucleotide sequence of DNA that results in the insertion of a stop codon?
Answers
Non-sense point mutations are the type of mutations caused by a change in the nucleotide sequence of DNA that results in the insertion of a stop codon.
Nonsense mutations refer to changes in a DNA sequence that result in one of the three termination (or "stop") codons replacing the regular codon for an amino acid. Because messenger RNA (mRNA) translation stops when a termination codon is reached, a mutation that changes a coding exon into a termination codon results in the mRNA's coding sequence being translated only halfway.
Premature termination mutations have two different effects. First, translation is impossible because the mRNA bearing a premature mutation is frequently selected for quick breakdown (via a biological process known as nonsense-mediated mRNA decay). The truncated protein is typically so unstable that it is quickly degraded within the cell, even if the mRNA is stable enough to be translated.
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a transmembrane segment of a membrane protein is all made up of alpha helix and contains 22 amino acids. what is the thickness of the membrane? if the transmembrane segment was made up of beta strand then how many amino acids in that beta strand will be needed to travel through the thickness of the membrane?
Answers
Nine amino acids are needed to travel through the thickness of the membrane.
Alpha-axial helix's distance between amino acids is 1.5. A
The number of gaps between the 22 amino acids in the helix is equal to (22-1) = 21.
Therefore, the helix's length is (21 X 1.5) = 31.5.
One alpha helix is sufficient to span the membrane's breadth, hence the formula is: span of the helix = thickness of the membrane = 31.5 A
The thickness of the membrane is determined by the formula above to be 31.5 AA.
In the beta-strand, there is 3.5 AA between each amino acid.
Therefore, (31.5/3.5) = 9 amino acids are needed.
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low-density lipoprotein (ldl) molecules bind to integral proteins that trigger the ldl entry into the cell in a vesicle. this process is known as
Answers
Low-density lipoprotein (LDL) molecules bind to integral proteins, causing a vesicles to form and release LDL into the cell. This method is referred to as receptor-mediated endocytosis.
In cell biology, a vesicle is a structure that can be found within or outside of a cell and is made up of liquid or cytoplasm that is encased in a lipid bilayer. Exocytosis, endocytosis, and material movement within the plasma membrane all naturally result in the formation of vesicles. They can also be created artificially, in which case they are known as liposomes (not to be confused with lysosomes). The vesicles are referred to as unilamellar liposomes when there is only one phospholipid bilayer and multilamellar liposomes when there are multiple layers. The membrane encasing the vesicle is also a lamellar phase, similar to that of the plasma membrane, and intracellular vesicles can fuse with the plasma membrane to release their contents outside the cell. Vesicles can combine with other cell organelles through fusion as well.
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In all cells, separation of replicated chromosomes is a prerequisite for cell division.
a. True
b. False
Answers
What conclusion can Della draw about how the membrane of her model cell is similar to a the membrane of a living cell?
Answers
Answer:
In plants, carbon dioxide (CO2) enters the chloroplast through the stomata and diffuses into the stroma of the chloroplast—the site of the Calvin cycle reactions where sugar is synthesized. ... This type of reaction is called a reduction reaction, because it involves the gain of electrons.
Explanation:
I understand what earth outer layer is made of underneath the water and soil on the surface
Yes
Or
Not yet
Explain
Answers
The planet earth being a terrestrial planet is made up of rocks and hard rigid slabs of rocks called plates. These plates float on the flexible (asthenosphere) Mantel.
I understand that earth is a rocks planet and is made up of rocks and these rocks are called plates.
This uppermost layer or the crust of the lithosphere is composed of SIAL that is rocks made from aluminum and silicon, oxygen components. The layer lying below this is made from the semi-fluid matter called as upper mantel that is the asthenosphere which is partly molten and is said as molten rock. Due to the less dynamicity of this layer the above crust floats or drifts.Hence the water and soil in the lithosphere are characteristic of the crustal rocks.
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The unusual strength of a glue makes it able to hold a heavy object, or load, as shown in the diagram below.
If the load exerts a strong downward force, the glue
A. destroys the force
B. exerts a stronger downward force
C. causes the load to accelerate upward
D. exerts an upward force that is equal to the downward force
Answers
Answer:
D
Explanation:
for every action, there is an equal and opposite reaction
If the load applies a significant downward force, the adhesive will apply an equivalent upward force. Thus, option D is correct.
What is role of upward and downward force?All objects on Earth experience weight, or a gravitational pull that is proportionate to their mass and is imposed by the planet's mass.
The acceleration that gravity gives to objects falling freely serves as a gauge of its strength.
All objects with mass, including our Earth, really bend and curve spacetime, which is what causes gravity to pull you toward the ground. What you experience as gravity is that curvature.
If the load exerts a strong downward force, the glue exerts an upward force that is equal to the downward force.
Therefore, exerts an upward force that is equal to the downward force.
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Tension is the major type of stress at transform plate boundaries
Answers
A researcher wants to introduce the human gene encoding tissue plasminogen activator (used to dissolve blood clots) into a mammal so that the protein will be secreted into the milk of the mammary gland. For the researcher to succeed, the gene should be:
Answers
Answer:
In the given case, for the researcher to succeed, there is a need to place the gene next to the promoter sequence, which gets expressed in the mammary cells. The sequences of DNA, which illustrate that where the transcription of a gene by the RNA polymerase initiates is known as the promoter. These sequences are generally situated at the 5 prime terminals of the initiation site of transcription or are situated directly upstream.
A fish finder sends out a pulse of ultrasound and measures the time needed for the sound to travel to a school of fish and back to the boat. If the fish are 15 m below the surface, how long will it take sound to make the round trip in the water?
Answers
Answer:
t=0.02 s
Explanation:
The speed of sound in water is approximately 1500 meters per second, which means it travels 1500 meters in one second. To calculate the time it takes for sound to travel to a school of fish 15 meters below the surface and back to the boat, we need to consider the round trip.
The sound wave must travel twice the distance between the surface and the school of fish, or a total of 2 × 15 meters = 30 meters. We can use the formula:
time = distance ÷ speed
to calculate the time it takes for sound to travel this distance. Plugging in the values, we get:
time = 30 meters ÷ 1500 meters per second
time = 0.02 seconds
Therefore, it will take sound approximately 0.02 seconds to travel to the school of fish 15 meters below the surface and back to the boat.
If the fish are 15 m below the surface, It will take 0.02 seconds long will it take sound to make the round trip in the water.
What is Round trip?In water, sound travels at a speed of about 1500 meters per second, or 1500 meters in a second. We need to take the round journey into account in order to determine how long it takes sound to get to a school of fish that is 15 meters below the surface and return to the boat.
The sound wave must travel a total of 30 meters, or 2 times the distance between the surface and the school of fish, or 15 meters. The formula is as follows: Time = Speed x Distance
To determine the amount of time needed for sound to cover this distance. When we enter the values, we obtain. 30 meters times 1500 meters per second equals time. It will take 0.02 seconds. As a result, sound will get there in about 0.02 seconds.
Therefore, If the fish are 15 m below the surface, It will take 0.02 seconds long will it take sound to make the round trip in the water.
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which of the following statements best describes what happens when a bacterial cell is placed in a solution containing a higher percentage of nacl than what is inside the cell?
Answers
When a bacterial cell is placed in a solution with a higher percentage of NaCl than its internal environment, the cell experiences water loss through osmosis, leading to shrinkage.
Option (C) is correct.
When a bacterial cell is placed in a solution with a higher percentage of NaCl (salt) than what is inside the cell, it creates a hypertonic environment. In this situation, water molecules tend to move out of the cell through osmosis. Osmosis is the movement of water molecules from an area of lower solute concentration (inside the cell) to an area of higher solute concentration (outside the cell) across a semipermeable membrane.
As water moves out of the bacterial cell to equalize the concentration of solutes, the cell loses water and starts to shrink. This loss of water causes the cytoplasm to become more concentrated, leading to the disruption of cellular functions. The cell membrane may detach from the cell wall, resulting in the cell shrinking and potentially undergoing cell death.
Therefore, the correct answer is C) The cell undergoes water loss and shrinks.
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The complete question is:
What happens to a bacterial cell when placed in a solution containing a higher percentage of NaCl than what is inside the cell?
A) The cell swells and bursts.
B) The cell remains unaffected.
C) The cell undergoes water loss and shrinks.
D) The cell undergoes water gain and expands.
Describe how acid rain
falling in a forest could disrupt the
trophic structure of the ecosystem.
Answers
Which statement best describes an organism's life cycle?
• The longer the life cycle, the larger the organism
•The shorter the life cycle, the larger the organism.
•The longer the life cycle, the less the chance of reproduction
•The shorter the lite cycle, the greater the chance of reproduction
Answers
Answer:
A
Explanation:
If we compare a whale to a house fly, You can clearly state a whale is much larger. Looking at the life span of both of these organisms, House flies have a pretty brief lifespan (they live up to about 4 weeks) while a Blue whales life span ranges from 80-90 years.So, with that being said, I believe A is your correct answer.
Where does the salt in salt water come from? Choose the two correct answers. A. dissolved salts from rocks B. rainwater flowing over land C. rainwater falling on oceans D. river water flowing into the ocean E. melting glaciers and polar ice caps
Answers
Answer:
C
Explanation:
when the rain falls its slightly acidic and that will erode the rocks on the ocean floor causing the water to be salty
Answer:
I feel like it would be A and C
1. Which of the following characteristics is not shared by ALL cells?
A) Have internal, membrane-bound compartments.
B) Capable of transcription and translation.
C) Capable of respiration.
D) Utilize enzyme driven reactions.
2. Which of the following structures contains the thylakoid membranes?
A) The Nucleus.
B) Lysosomes
C) Mitochondria
D) Chloroplasts
Answers
1. The characteristic that is not shared by ALL cells is "Have internal, membrane-bound compartments." .2. The structure that contains the thylakoid membranes is Chloroplasts
Explanation:Cells come in all shapes and sizes, but they all have a few things in common. For example, they all have a cell membrane that separates them from the surrounding environment. They also have cytoplasm, which is a fluid-like substance that fills the inside of the cell.
Additionally, they all have DNA, the genetic material that controls the cell's activities. While all cells share these characteristics, they do not all have internal, membrane-bound compartments. For example, bacteria are a type of cell that lacks these compartments.
2. The structure that contains the thylakoid membranes is Chloroplasts. Explanation: Chloroplasts are organelles found in plant cells that are responsible for photosynthesis. They contain a complex system of membranes called thylakoids, which are arranged in stacks called grana.
These membranes are the site of photosynthesis, the process by which plants convert sunlight into energy. The other options in the question do not contain thylakoid membranes.
The nucleus contains DNA, lysosomes contain enzymes that break down waste products, and mitochondria are the site of cellular respiration.
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