What is the main function of a selectively permeable cell membrane?
Answers
Answer:
The main function of a cell membrane is to let some things in and let some thing out of the cell.
The main function of a selectively permeable cell membrane is to maintain the balance of transporting molecules inside the cell with respect to the outer environment.
What is a selectively permeable membrane?A selectively permeable membrane may be defined as a membrane that permits the passage of some molecules or ions and inhibits the passage of others with respect to cells.
It is a type of membrane that prevent the passage of numerous toxic compounds inside the cell. It also has the capability to make transport of the molecules by means of the active as well as passive method.
Through this membrane, only specific molecules like water easily pass through the cell membrane directly. While the transport of other required molecules require energy, and hence the process known as active transport.
Therefore, the main function of a selectively permeable cell membrane is to maintain the balance of transporting molecules inside the cell with respect to the outer environment.
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Related Questions
WILL MARK BRAINLIEST PLEASE HELPP
Answers
Answer:Testes
Explanation:
The chromosomes of offspring are not identical to those of their parents or siblings because ______ is shuffled during meiosis.
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The chromosomes of offspring are not identical to those of their parents or siblings because genetic information is shuffled during meiosis.
Meiosis can be described as a cell division process by which gamete cells divide. The number of chromosomes is reduced to half in this cell division process.
During the process of meiosis, genetic information is shuffled between non-sister chromatids of the homologous chromosomes. This shuffling process is referred to as crossing over. A new combination of alleles is formed due to the process of crossing over.
It is due to the process of crossing over that the organisms produced are not identical to each other or the parents. Genetic diversity is important in order for populations to survive which is possible through the process of meiosis.
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Which molecule is a source of energy, a store of energy and can mix with water?
Answers
Answer:
carbohydrates
Explanation:
Molecules made up of sugars. Cells use carbohydrates as a source of energy and for energy storage.
Evolution occurs when there is selection pressure for some heritable trait over a period of time.
True
False
Answers
True
Explanation
Everything is always evolving over an amount of time, for example say we had two types of rabbits, one had white fur and the other has brown. If the one that has white fur tries to live in the same habitat as the one with brown fur they will be able to be spotted easier. So the brown rabbits they have the “desirable trait” or “heretable trait” because they can hide from being hunted. Even then the brown rabbit will adapt over time, evolution is always competing, so if the brown rabbit needs to hop higher then over time the rabbits that have the strongest trait will become the new normal.
Hope that makes sense, and I hope this helps :)
- How would you classify the relationship between coral and the small crabs?
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Answer:
Explanation:
How would you classify the relationship between coral and the small crabs? Their relationship is mutualistic, as the crabs provide protection for the coral reef and the reef provides the crabs a home.
Question: How would you classify the relationship between coral and the small crabs?
Answer: Hello: ) ✨ Their relationship is mutualistic, as the crabs provide protection for the coral reef and the reef provides the crabs a home.The corals and algae have a mutualistic relationship. The coral provides the algae with a protected environment and compounds they need for photosynthesis.
Explanation:
7 3 State one way in which the temperature in the above investigation can be changed. 4 The information in the table below shows the results of an investigation with a water plant.
Answers
One way in which the temperature in the above investigation can be changed is by adjusting the environmental conditions in which the water plant is kept.
Temperature can be controlled by altering the surroundings or using temperature-regulating equipment. For instance, the experiment could be conducted in a controlled environment such as a laboratory or a growth chamber where the temperature can be precisely set and maintained.
By adjusting the temperature, the investigation can observe the effects of different temperature levels on the growth, development, or physiological processes of the water plant. This allows for the study of temperature-dependent responses and how they may influence the plant's overall performance.
It's important to note that the specific details of the investigation and the table provided are not mentioned, so the explanation regarding the results of the investigation cannot be provided based on the given information.
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what are bacteria found
Answers
Answer:
Bacteria are found in every habitat on Earth: soil, rock, oceans and even arctic snow. Some live in or on other organisms including plants and animals including humans. There are approximately 10 times as many bacterial cells as human cells in the human body.
Answer:
Bacteria are found in every habitat on Earth: soil,rock,oceans, and even arctic snow
in one paragraph, how would you summarize the major causes, risk, and effects of the zika virus to someone who has never heard about the condition?
Answers
The mosquito that transmits the Zika virus is common all throughout the world.
Mosquito bites generally spread the Zika virus to people in tropical and subtropical areas of the world. Most Zika virus sufferers show no symptoms at all. Some patients frequently have a mild temperature, rash, and painful muscles. The Zika virus may, in extremely rare instances, cause problems with the brain or neurological system, such as Guillain-Barre syndrome, even in people who never show any symptoms of infection. Other names for the Zika virus infection include Zika, Zika fever, and Zika virus illness.
Symptoms Up to 4 out of 5 people who have the Zika virus exhibit no symptoms at all. When symptoms do materialize, they usually begin two to fourteen days after a person.
Zika virus symptoms most frequently manifest as:
Rash of a mild feverEspecially in the hands or feet, joint discomfortRed eye color (conjunctivitis)To know more about zika virus visit:
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An airplane, starting from rest, accelerates at 5.0 ft/s/s down a runway for 30 seconds what will be the distance that the airplane goes during the time
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The distance that the airplane goes during the time is found to be 2,736 meters when it has an acceleration of t 5.0 ft/s/s down a runway for 30 seconds.
What is Acceleration?Acceleration may be characterized as the rate of change of the velocity of an object with respect to time. It is a type of vector quantity as it has both magnitude and direction.
According to the question,
The speed of an airplane = 5.0 ft/s/s. = 91.2 m/sec
The time taken by an airplane = 30 seconds.
The distance of an airplane is calculated with the help of the following:
Speed = Distance/Time taken.Distance = Speed × Time taken
= 91.2 × 30 = 2,736 meters.
Therefore, the distance that the airplane goes during the time is found to be 2,736 meters.
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What happens when a mutation occurs during the formation of gametes in a parent sex cell?
Answers
Answer:
if it's a silent mutation, nothing significant will happen, but if it's a frame shift mutation, it can make the baby deform.
Answer: most mutations will have no effect, although in rare cases an abnormal foetus may develop and even more rarely the embryo may be non-viable.
Explanation: A mutation at this stage is probably due to a random result of an external effect (cosmic ray for example) and probably a change in one nucleotide (a single nucleotide polymorphism). It is unlikely that the mutation will be an insertion, deletion or inversion.
Whatever the mutation, it is unlikely to occur in the relatively small proportion of coding DNA. If it does occur in coding DNA it is still unlikely to be at a critical codon. If it does occur at a critical codon, it may still code the the same amino acid, particularly if it is a third nucleotide.
There is a low probability that the mutation will prevent the formation of a fully functional protein, by altering a critical amino acid or altering the frame by changing a stop codon, or creating a stop codon, or altering a promoter region. Even in this case, any error can be avoided if the other allele is intact.
It is possible, however, that a mutation could result in a development abnormality (cystic fibrosis is an example), or a non-viable embryo.
For which of these questions could a testable hypothesis be developed? Check all that apply.
Answers
Answer:
check 1,3,and 4
Explanation:
Difference between viviparous,oviparous and oogenesis
Answers
Answer: What is the difference between oviparous and viviparous?
Oviparous and viviparous are such two methods. The main difference between oviparous and viviparous animals is that oviparous animals do not undergo any embryonic development inside the mother whereas viviparous animals develop into a young animal inside the mother. This means oviparous animals lay eggs.
Explanation: i hope this helps
What is the chemical nature of neurotransmitters, and how can drugs
alter their function?
Answers
Neurotransmitters are the substances which act as signaling molecules in the body. Many drugs mimic these neurotransmitters by activating different cells in the body.
What are neurotransmitters?
A neurotransmitter is a signaling molecule which is secreted by a neuron to affect another cell or neuron across a synapse. The cell receiving this signal, any main body part, or the target cell, may be another neuron, however they could also be a gland or muscle cell.
Drugs interfere with the way neurons send, receive, and process signals via neurotransmitters in the nervous system. Some drugs, such as marijuana and heroin, can activate neurons in the body because their chemical structure mimics that of a natural neurotransmitter present in the body. This allows the drugs to attach onto and activate the neurons.
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Mutations within the DNA sequence of an organism can-
a) result in alterations that are harmful to an organism
b) result in alterations that do not affect the organism
c) all of the above
d) result in alterations that are helpful to an organism
Answers
Mutations within the DNA sequence of an organism can result in alterations that are harmful to an organism, resulting in alterations that do not affect the organism. Therefore option c is correct.
Mutations within the DNA sequence of an organism can result in a range of outcomes.
Some mutations can be harmful, leading to changes in protein structure or function that negatively impact the organism's survival or reproductive success.
Other mutations may have no significant effect on the organism, particularly if they occur in non-coding regions or are "silent" mutations that do not change the amino acid sequence.
Additionally, mutations can be beneficial, providing advantageous traits that enhance the organism's adaptation to its environment or improve its reproductive fitness.
The variability in mutation outcomes is a fundamental driver of genetic diversity and evolution in populations.
Therefore option C all of the above is correct.
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scientists have been tracking the outbreak of a disease. the disease is spreading rapidly across several continents in different hemispheres around the world. what can be concluded from this information?
Answers
Answer:it might be a viral disease caused by viruses
Explanation:
virus contains either RNA or
From the information provided, several conclusions can be drawn. The disease has a high transmission rate: The fact that the disease is spreading rapidly across multiple continents indicates that it has a high rate of transmission. This suggests that it can easily be passed from person to person, potentially leading to widespread infection.
Describe the disease has global reach?The disease has global reach: The fact that the disease is affecting different continents in different hemispheres suggests that it has a global reach. It is not confined to a specific region or country but has the ability to spread across international borders.
The illness may have a large impact: The disease may have a substantial impact on public health, healthcare systems, and maybe economics. This is indicated by the global nature of the epidemic over numerous continents. In terms of prevention, control, and treatment, it might be a significant challenge for authorities, medical professionals, and communities.
Given the worldwide scope of the epidemic, international coordination and cooperation across nations, organisations, and health agencies may be vital to manage and contain the illness.
Sharing knowledge, tools, and tactics can aid in preventing the spread of the disease and reducing its effects.
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The giant panda bear is an endangered species. Which natural behavior
puts the giant panda bear at most risk for extinction?
lives only in mountain forests at elevations above 4,000 feet
eats only bamboo plants 99% of the time
is usually active during the morning and early evening
moves to lower elevations that are warmer during the winter
Answers
describe the different cell types in the seminiferous tubules that are involved in the process of spermatogenesis
Answers
Several different cell types within the seminiferous tubules work together to create mature spermatozoa through spermatogenesis. These cells include Sertoli cells, spermatogonia, primary spermatocytes, secondary spermatocytes, spermatids, and mature spermatozoa.
There are several different cell types in the seminiferous tubules that participate in the process of spermatogenesis. These cell types include:Sertoli cells: These cells are columnar in shape and are located in the epithelium of the seminiferous tubules. Sertoli cells are involved in the regulation of spermatogenesis. They also help to nurture developing sperm cells through the secretion of growth factors and hormones.Spermatogonia: These are the undifferentiated cells that serve as the source of new sperm cells. They divide via mitosis, giving rise to more spermatogonia, as well as primary spermatocytes.Primary spermatocytes: These are the cells that arise from the differentiation of spermatogonia. Primary spermatocytes undergo meiosis to form secondary spermatocytes.
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Sinkholes associated with natural processes are characteristic of what type of bedrock?
Answers
Answer:
Karst
Explanation:
Karst is a type of landscape where the dissolving of the bedrock has created sinkholes, sinking streams, caves, springs, and other characteristic features.
i need help! can someone pls help me
Answers
Answer:
Two
Explanation:
A male and female cromosome
If there are 2 DNA molecules at the beginning of S phase, how many DNA molecules is there at end of S phase?
4
3
2
1
Answers
Answer:2 is your answer
Which nucleic acid carries genetic information from the cell nucleus to the
ribosomes?
*
DNA
messenger RNA
transfer RNA
Answers
the kidneys filter blood
messenger RNA (mRNA), molecule in cells that carries codes from the DNA in the nucleus to the sites of protein synthesis in the cytoplasm (the ribosomes).
To study the effects of a mineral deficiency, a number of rats are divided into two groups: one group is fed a normal diet, whereas the other group is fed the same diet but with one necessary mineral left out. The animals receiving the normal diet remained healthy; those in the other group grew weaker. Formulate a hypothesis based on this experiment.
Answers
Answer:
The best hypothesis would be - If missing mineral in the diet is not provided and is needed for the health of rats, the rats will grow weak.
Explanation:
A hypothesis is a possible or suggested explanation for any natural or unexplained phenomenon or occurrence based on the logic and available evidence or observation.
In this experiment, the phenomenon is that minerals are required for the growth of the rats as its explained by the experiment in which rats with normal diet are stronger than the diet with minerals left out. So the best hypothesis would be - if missing mineral which is required for health not provided to the rats, they grow weak.
which of these statements about enzyme inhibitors is true?
Answers
The action of inhibitors may be both either reversible or irreversible is trues about enzyme inhibitors.
What is enzyme inhibitors?
A chemical that binds to an enzyme and inhibits its activity is termed as an enzyme inhibitor. Proteins are referred as enzymes speed up the chemical processes that turn substrate molecules into products and are essential for life. An enzyme inhibitor is what? Inhibitors of enzyme activity are chemicals that bind to the enzyme without altering the protein structure of the enzyme.
Enzyme inhibition reactions come in three different varieties.
The inhibition of competition.Inhibitive non-competition.Inhibitive Non-Competition.To know more about enzyme inhibitors visit
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how does energy efficiency link with energy efficiency?
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Answer:
......................
Select the correct image.
Evan sees a lunar eclipse one night. When he briefly observes the Moon, about half of it is bright and the other half is dark. He wonders what phase the Moon is in during this event.
Evan decides to use a model of the Sun-Earth-Moon system to determine the Moon's phase during a lunar eclipse. He uses a light bulb to represent the Sun and its light, a softball to represent the Earth, and a golf ball to represent the Moon.
Which diagram shows how Evan should arrange his model to investigate a lunar eclipse?
Answers
Answer:
sorry I can't help you because there are no diagrams for me to see
true or false: the thinner peptidoglycan layer of gram-positive bacteria allows the crystal-violet-iodine complex to leave the cell.
Answers
The given statement "the thinner peptidoglycan layer of gram-positive bacteria allows the crystal-violet-iodine complex to leave the cell." is True.
Peptidoglycan is a protein-carbohydrate molecule that is an important component of bacterial cell walls. It aids in the cell's protection and shapes and maintains it. The crystal violet-iodine (CVI) complex is used in Gram stain tests to detect bacterial cell walls. The Gram stain is a laboratory technique used to differentiate bacterial species into two groups based on their cell wall composition.
The crystal violet-iodine (CVI) complex stains both gram-positive and gram-negative bacteria during the initial staining step. The cell wall of gram-positive bacteria contains a thick layer of peptidoglycan, which traps the crystal violet-iodine complex inside the cell during the staining process.
However, the thinner peptidoglycan layer in the cell wall of gram-positive bacteria allows the crystal-violet-iodine complex to leave the cell, making it unable to retain the dye when rinsed with alcohol during the decolorizing step. As a result, gram-positive bacteria appear purple under the microscope.
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What is the portion of DNA that contains information for the physical expression of a trait or characteristic
Answers
explanation:
- sections of DNA that contain information that determine your physical features are called genes. Since you have two pairs of chromosomes, you also have two pairs of genes, one from your father and one from your mother. These pairs of genes then determine certain physical features or traits(phenotypes).
Answer:
gene
Explanation:
macula densa cells release paracrine agents which cause constriction of afferent arterioles and dilation of efferent arterioles. true or false
Answers
True. Macula densa cells release paracrine agents, such as adenosine and nitric oxide, which cause constriction of afferent arterioles and dilation of efferent arterioles.
This helps in regulating glomerular filtration rate and maintaining proper kidney function.
When the macula densa cells detect an increase in sodium chloride concentration or a decrease in fluid flow, they respond by releasing paracrine agents, such as adenosine and nitric oxide. These paracrine agents have specific effects on the arterioles in the renal vasculature.
Adenosine is a potent vasoconstrictor. When released by the macula densa cells, it acts on the afferent arterioles, causing them to constrict. This constriction helps regulate the blood flow into the glomerulus, reducing the pressure and subsequently decreasing the GFR.
By constricting the afferent arterioles, adenosine helps prevent excessive filtration and ensures that the kidney is not overwhelmed with an excessively high GFR.
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Ples help!!! What is the relationship between heat waves and drought?
Answers
The karyotype of an individual with trisomy 18 is represented in the figure. Which of the following errors would have occurred in
A
A failure of sister chromatids to separate in mitosis
Answers
The karyotype of an individual with trisomy 18 is represented as Edward's syndrome. It occurs due to failure of the sister chromatids to separate in mitosis.
What are Mitotic errors?
The karyotype with trisomy 18 is a genetic disorder. It is also known as Edward's syndrome. In this disorder, a person has a third copy of the material from chromosome 18, instead of the usual 2 copies. Rarely, the extra chromosomal material may be attached to another chromosome i.e., translocation. In most cases, this chromosome is not passed down through the families.
During cell division, chromosomes do not always separate equally into daughter cells which results into one daughter cell with extra chromosome and one daughter cell with no or small stretch of chromosome. This sometimes happens in mitotic division, when the sister chromatids fail to separate out during anaphase. One daughter cell thus ends up with more chromosomes in its nucleus than the other cell.
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