Answer:
SNS and the PNS
Explanation:
Your heart rate is controlled by two branches of the involuntary nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases hormones (catecholamines; epinephrine and norepinephrine) to accelerate the heart rate. These are your fight or flight response.
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All of the following are true of spermatogenesis EXCEPT: Question 7 options: The products are spermatozoa that each have a head, midpiece and tail. DNA replicates once, but cells divide twice. Genetically diverse spermatids are created. One spermatogonium produces 4 spermatids Spermatids containing 23 chromosomes (1n) are produced.
The spermatozoa products have a tail, head, and midpiece.
Spermatogenesis is defined as gamete production in human males. “It is the production of sperm from the primordial germ cells.” It takes place in the male testes. In the process, spermatids will be produced, four through the reductional cell division known as meiosis. Every spermatid is haploid in number, and the genetic material is diverse. As a result, siblings will not be identical to each other. The spermatozoa are the immature sperm cell that will develop a head, middle piece, and tail. But it is not a precursor of the production of sperm cells via cell division.
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pre-lab questions 1. what is meant by urogenital opening? 2. why do most mammals have testes in an external sac? 3. what is the vaginal orifice?
Body waste as well as reproductive fluids are released into the environment outside the body cavity through the urogenital opening.
Because testes should be colder than the human body, the majority of male mammals have them in an external sac. Male mammal sperm are housed in the testes, therefore the reality that they will be in an external sac prevents early activation of sperm because of their colder temperature.Body waste & reproductive fluid are released into the environment outside the body cavity through the urogenital opening. Discharge from the urinary, digestive, & reproductive systems in some creatures, such as birds and many fish, empty into a cloacal sac. The term "vaginal orifice" simply refers to the vagina's actual entrance.
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Humans use the calories they obtain from A) food as their source of energy. 8. B) water D) minerals C) sunlight
Answer: A
Explanation: people get their energy from food, as we are not primary producers
Both plant and animal cells have mitochondria because they both
A. carry on photosynthesis.
B. have a large central vacuole.
C. have endoplasmic reticulum.
D. need ATP for energy
Both plant and animal cells contain mitochondria because both require ATP for energy. So, the correct option is (D).
What is Mitochondria?A mitochondria is defined as an organelle found in the cells of most eukaryotes, such as animals, plants and fungi where they have a double membrane structure and use aerobic respiration to generate adenosine triphosphate which is used as a source throughout the cell in the form of chemical energy by plant and animal cells.
These are structures within cells that convert energy from food into a form that cells can use. Each cell contains hundreds to thousands of mitochondria, which are located in the fluid that surrounds the nucleus, the cytoplasm.
Thus, both plant and animal cells contain mitochondria because both require ATP for energy. So, the correct option is (D).
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Answer the following questions in short:
1. Explain how soil is formed?
2. How is clayey soil useful for crops?
3. List the differences between clayey soil and sandy soil.
Please tell ASAP
please it's urgent
and this is for class 7
1. Soil is one of the essential natural resource that holds the life in Earth. Soil is the uppermost layer in Earth's surface. It is formed by the continuous weathering of mountains over thousands of years. The rock from which a soil is formed is called its parent material. The nutrients that the soil have will be depending upon the parent material.
The weathered soil will be carried by carriers or weathering agents like wind, water and glaciers.
2. Clayey soil is very good because of its water holding capacity and its richness in organic matter. Crops like wheat and paddy is cultivated extensively in places with clayey soil because of its properties.
3. Clayey soil have large water holding capacity while water holding capacity of sand is very less. Clayey soil consists of particles with less particle size while sand particles have high particle size. Clayey soil is highly fertile but sandy soil is not. Because of the same reason, a large variety of crops are cultivated in clayey soil.
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The absorption of human-generated CO2 by the oceans __________.
A. increases the oceanic concentration of carbonic acid
B.increases the oceans' acidity and pH
C. reduces the carbonate ion concentration in the oceans and threatens calcifying organisms in marine ecosystems
D. increases the hydrogen ion concentration in the oceans but decreases the carbonate ion concentration and threatens the livability of the oceans for organisms that produce calcium carbonate shells
Option D, "increases the hydrogen ion concentration in the oceans but decreases the carbonate ion concentration and threatens the livability of the oceans for organisms that produce calcium carbonate shells," is the correct answer.
When human-generated CO2 is absorbed by the oceans, it reacts with water to form carbonic acid. This increases the hydrogen ion concentration in the oceans, which makes the oceans more acidic (lower pH). As the oceans become more acidic, the concentration of carbonate ions decreases, which can be harmful to calcifying organisms that rely on carbonate ions to produce shells and other structures made of calcium carbonate. This can threaten the livability of the oceans for these organisms.
Option A, "increases the oceanic concentration of carbonic acid," is partially correct but does not fully describe the consequences of CO2 absorption by the oceans.
Option B, "increases the oceans' acidity and pH," is also partially correct but does not fully describe the consequences.
Option C, "reduces the carbonate ion concentration in the oceans and threatens calcifying organisms in marine ecosystems," is also partially correct but does not fully describe the consequences.
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What is the purpose of meiosis?
A. Produces diploid cells
B. Produces gametes (sex cells)
C. Produces cells for growth and repair
Answer:
b) Produces gametes (sex cells)
Explanation:
The major purpose of meiosis is the production of sex cells. It produces gametes (sex cells) which are haploid. Therefore, the option (b) is the correct answer.
Match the T-lymphocyte type with its function 1. Cytotoxic T-lymphocytes: (Click to select) 2. Memory T-ymphocyte(Click to select) Provide a secondary response and long-lasting immunity Promote phagocytosis and inflammation Cause cell lysis
The correct answer is 1. Cytotoxic T-lymphocytes: Cause cell lysis; 2.
Memory T-lymphocytes: Provide a secondary response and long-lasting immunity. Cytotoxic T-lymphocytes are white blood cells that have the ability to recognize and destroy infected or abnormal cells.
They do this by releasing chemicals that cause cell lysis, or breaking down the cell membrane. Memory T-lymphocytes provide a secondary response to an antigen and are responsible for long-term immunity. They are able to recognize previously encountered antigens and produce an immune response much more quickly. Memory T-lymphocytes do not promote phagocytosis or inflammation.
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state three importance of osmosis in plants
Answer:
1. Osmosis helps in maintaining water content within a plant cell. 2. It provides turgidity to the softer cells of a plant body. 3. Osmosis controls the absorption of water by root hairs from the soil. 4. It controls the conduction of water from xylem elements to adjacent cells. 5. Osmosis also helps in retaining the turgidity of the cell. 6. It plays an important role in the movement of stomata during transpiration. 7. The opening and closing of stomata are maintained by osmosis. 8. It helps in the movement of liquid through a biological membrane.
Explanation:
Answer: Functions of Osmosis in plants (If dat's wut u ment)
Explanation: Osmosis helps in retaining the turgidity of the cell, plays an important role in the movement of stomata during transpiration. The opening and closing of stomata are maintained by osmosis. It helps in the movement of liquid through a biological membrane.
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3. Write an Expression If X represents the half-life of
potassium-40 and Y represents the half-life of carbon-14, write
an expression that correctly compares the two half-lives.
The expression is: X/Y = K-40/C-14
This expression compares the two half-lives by expressing the ratio of the half-life of potassium-40 to the half-life of carbon-14. It shows that whatever the value of the half-life of potassium-40 is, it is equal to that number divided by the half-life of carbon-14.
Mr. Buchanan enjoys bird watching. He feeds several species of birds in his backyard each winter. He has birdhouses and feeders attached to his trees. When he fills them with feed, birds fly in and sit on the power lines. What type of behavior is shown by these. birds?
A. Learned
B. Innate
C. Dangerous
D. Instinctive
Answer: D: Instinctive.
Explanation:
The behavior shown by the birds is instinctive.
Instinctive behavior is a type of behavior that is inherent or innate, meaning that it is not learned through experience or practice. Instinctive behaviors are usually associated with survival, such as finding food and shelter, and they are often triggered by certain stimuli in the environment.
In this case, the birds are exhibiting an instinctive behavior by flying in and sitting on the power lines when the feeders are filled. They are attracted to the food and are following their natural instincts to find and consume it. This behavior is not learned or acquired through experience, but rather is a natural response to the presence of food.
What are the 4 stages of cancer and how do they differ?
There are 4 stages of cancer, that are Stage I, Stage II, Stage III, and Stage IV.
Cancer has not spread to any lymph nodes as well as other tissues and is confined to a small location when it is in the stage known as stage I. In stage II, cancer has progressed but has not yet spread to other parts of the body. Cancer has progressed to stage III, which indicates that it has grown in size and may have migrated to lymph nodes as well as other tissues. If you are at stage IV of cancer, it means that the disease has spread to other organs or parts of your body.
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Below is a sequence of bases along one side of a DNA molecule.
Write out the sequence of DNA bases that would pair with the
ones shown.
ATGGCGATT
Four chemical bases—adenine (A), guanine (G), cytosine (C), and thymine—make up the code in which the information in DNA is stored (T). About 3 billion bases make up human DNA, and more than 99 percent of those bases are the same in every person.
What are the characteristics of bases of DNA molecules?The structure of DNA is a double helix, which is made up of two connected strands that loop around one another to resemble a twisted ladder.
Deoxyribose and phosphate groups alternately form the backbone of each strand. One of the four bases—adenine (A), cytosine (C), guanine (G), or thymine—is joined to each sugar (T).
Therefore, TACCGCTAA is the sequence of DNA bases that would pair with the ones shown.
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In evolutionary terms, an organism's fitness is measured by its _____.
Assume that a DNA double helix contains 100 base pairs (one pair is A-T or C-G) and there are 45 cytosines. (___/2 points) How many guanines are there
There are 55 guanine on DNA double helix that contain 100 base pair with 45 cytosines.
How to find out how many guanine in there?DNA is molecule that exist in the cell contain a certain information of the organism such as structure or their characteristic. In DNA one pair at A-T or C-G which means every 1 adenine will be pair with 1 thymine and every cytosines will be pair with 1 guanine. Since there is 55 cytosines, there have to be 55 guanine also in that DNA . We can say that 100 base pair contain 55 pair of C-G and 45 pair of A-T because cytosines and guanine pair has taken 90 base pair.
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Down-regulation may allow a target cell toa) increase its number of receptors for a ligand.b) decrease its number of receptors for a ligand.c) increase its binding affinity for a ligand.
Down-regulation may allow a target cell to decrease its number of receptors for a ligand. Here option B is the correct answer.
Down-regulation is a process by which a cell decreases the number of receptors for a specific ligand on its surface.
This can happen through several mechanisms, including receptor internalization and degradation, transcriptional repression of the gene encoding the receptor, or a decrease in the synthesis of the receptor protein.
This process is a negative feedback mechanism and it helps in maintaining the balance of signaling pathways inside the cell. It also helps in avoiding the over-activation of pathways which can lead to cellular damage or malfunction.
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Practice problems Pre-Lab Questions 1. A candy bar has a total mass of2.5ounces. In a calorimetry experiment, a1.0 gsample of this candy bar was burned in a calorimeter surrounded by1000 gof water. The temperature of the water in contact with the burning candy bar was measured and found to increase from an initial temperature of21.2∘Cto a final temperature of24.3∘C. a. Calculate the amount of heat in calories released when the 1.0-g sample burned. b. Convert the heat in calories to nutritional Calories and divide by the mass of the burned sample in grams to obtain the energy content (also called fuel value) in units of Calories per gram. c. Multiply this value by the total number of grams in the candy bar to calculate the total calorie content of the candy bar in Calories. Hint: Convert the mass in ounces to grams. 2. Consult the nutritional labels on two of your favorite snack foods: Report their total calorie content (total Calories) and calculate their fuel value (Calories per gram).
Part 1: 12,970 J of heat released when 1.0 g sample is burned
Part 2: 3.1 Calories (Cal) nutritional calories/g
Part 3: 219.697 Calories
Given,
Statement 1: A candy bar has a total mass of 2.5ounces = 70.87 gm
Statement 2: In a calorimetry experiment, 1.0 g of sample of this candy bar was burned in a calorimeter surrounded by 1000 g of water.
Statement 3: The temperature of the water in contact with the burning candy bar was measured and found to increase from an initial temperature of 21.2∘C to a final temperature of 24.3∘C
Question 1:
q = mC∆T
q = heat
m = mass of water = 1000 g
C = specific heat of water = 4.184 J/gº
∆T = change in temperature = 24.3 - 21.2 = 3.1º
q = (1000 g)(4.184 J/gº)(3.1º)
q = 12,970 J of heat released when 1.0 g sample is burned
Question 2:
1 Cal (nutritional) = 1000 cal
4.184 J = 1 cal
Using these conversion factors, calories (cal) and nutritional calories (Cal) can be found:
12,970 J x 1 cal / 4.184 J = 3100 calories (cal)/g
3100 cal x 1 Cal / 1000 cal = 3.1 Calories (Cal) nutritional calories/g
Question 3:
Total caloric content of the candy = 3.1 Cal/g x 70.87 g = 219.697 Calories (nutritional)
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In a normal cell when a mistake or mutation is detected, the cell cycle is stopped and the cell
Check ALL answers that apply
Continues on in the cell cycle without repair
Is repaired and continues in the cell cycle
Goes through apoptosis if the damage can not be repaired
Waits for repair, is repaired and continues in the cell cycle
In a normal cell when a mistake or mutation is detected, the cell cycle is stopped and the cell is repaired and continues in the cell cycle, goes through apoptosis if the damage can not be repaired and waits for repair, is repaired and continues in the cell cycle (option 2, 3 and 4).
What are cell cycle checkpoints?The expression cell cycle checkpoints denote different stages in the cell cycle where the cell 'control' everything is fine in order to proceed.
Therefore, with this data, we can see that cell cycle checkpoints are control processes of the cell.
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When a single cell of E. coli reproduces it first duplicates its dna next the cell elongates as each copy of dna is pulled toward opposite ends of the cell the membrane then pinches inward dividing the cytoplasm into two halves and producing two daughter cells what is true about these daughter cells
The daughter cells are genetically identical to the parent because they are produced by asexual reproduction. Option C.
What is binary fission?Binary fission is an asexual reproductive method found in certain microbes such as some bacteria. The method involves the pinching or division of a single cell into two halves and the distribution of genetic materials into each half to produce two daughter cells.
Binary fission, being an asexual form of reproduction leads to the production of daughter cells that are identical to the parent cells both morphologically and genetically. They daughter cells are often referred to as clones of the parents.
This is unlike the daughter cells produced from sexual reproduction. These daughter cells are unique both genetically and morphologically from their parents.
The form of reproduction method described in the passage is binary fission. Thus, the daughter cells would be genetically identical to the parents because it is a form of asexual reproduction.
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When a single cell of E. coli reproduces, it first duplicates its DNA. Next, the cell elongates as each copy of DNA is pulled toward opposite ends of the cell. The membrane then pinches inward, dividing the cytoplasm into two halves and producing two daughter cells. What is true about these daughter cells?
A.
They are genetically different from the parent because they are produced by sexual reproduction.
B.
They are genetically identical to the parent because they are produced by sexual reproduction.
C.
They are genetically identical to the parent because they are produced by asexual reproduction.
D.
They are genetically different from the parent because they are produced by asexual reproduction.
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In mice, there has been a gene linked to key parenting skills. When it is silenced, mothers do not nurse or lick pups or defend them against intruders. Which gene performs similarly in female humans
The gene that performs similarly in female humans is the oxytocin receptor gene (OXTR).
Oxytocin is a hormone released in humans and animals during times of bonding, and it has been linked to parenting skills in mice and humans. Silencing of the oxytocin receptor gene has been found to interfere with mothering behaviors such as nursing, tending to pups, and defending babies from intruders.
photoautotrophic unicellular organism with a shell made of silica is most likely a(n) ______.
Select one:
A. diatom
B. apicomplexan
C. foram
D. dinoflagellate
Answer:
photoautotrophic unicellular organism with a shell made of silica is most likely an, A. diatom
The soft, jelly-like substance inside intervertebral disks is called ________.
a. dens
b. nucleus pulposus
c. anulus fibrosus
d. centrum
EADING NOTES
1. Ecosystems Can Change
LESSON 7
Choose one of these ecosystem changes: a flood, a dust storm, a volcano, or a forest fire.
Write about how you think it changes ecosystems.
Flood: Floods change ecosystems by washing away.
many plants grow in. They also kill or drive away many organisms.
Dust storm: Dust storms are caused by very dry weather. High winds
and dirt from an ecosystem, so not very many
Volcano: When volcanoes erupt, they usually kill most of the
They also cover or wash away the soil or dirt that the.
2 Unit Living Things and Ecosystems
Forest fire: When a forest fire happens, it kills a lot of the
system. It also kills the
grew
that live in an eco-
or drives thew away.
Teachers' Curriculum Institute
Floods Cause sedimentation and erosion in an ecosystem.
What are the characteristics of an ecosystem?An ecosystem consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows.
Ecosystems are organized to better understand the frame of reference in which they are being studied. They are organized from smallest to largest; organism, population, community, ecosystem.
There are four basic components of an ecosystem: abiotic substances, producers, consumers, and reducers, which are also known as decomposers.
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1
Which spheres of Earth are directly influenced when human-caused air pollution leads to acid rain that dissolves
limestone rocks?
Answer:
The spheres of earth that gets influenced by the human caused air pollution which leads to acid rains that dissolves the limestone rocks are atmosphere, geosphere and the hydrosphere.
Nitric and sulfuric acids are created when these chemicals interact with water vapour or dust particles and fall to ground. They now move into the geosphere, hydrosphere, and biosphere. They erode rocks and buildings, contaminate water sources, and poison plant and animal life.
What spheres of Earth are influenced in human-caused air?The anthroposphere, sometimes known as the technosphere, is the region of the environment that humans have developed or modified for use in human activities and human habitation. It is a globe that is connected to the Earth.
Therefore, The atmosphere, geosphere, and hydrosphere of the planet are the three spheres that are affected by human-caused air pollution, which results in acid rains that disintegrate limestone rocks.
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Name,
Complete the table below with the role that component of the plasma membrane plays in the cell
Phospholipid bilayer
Polar hydrophilic head
Nonpolar hydrophobic tail
Cholesterol
Carbohydrates
Proteins
The role that component of the plasma membrane plays in the cell include the following below:
Phospholipid bilayer - It maintains the integrity of the cardiomyocyte due to the permeability barrier formed.Polar hydrophilic head - It forms electrostatic interactions with the phospholipid heads.Nonpolar hydrophobic tail - It allows fat-soluble substances and water-soluble substances to pass through it.Cholesterol - It regulates the fluidity of cell membranes.Carbohydrates - It provides protection for cells.Proteins - It provides signaling into and out of the cells.What is Plasma membrane?This is referred to as a biological membrane that separates and protects the interior of all cells from the outside environment.
There are different components such as Cholesterol which helps to regulate the fluidity of cell membranes and there are also others which are listed above.
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PLEASE HELP !!
1. Calculate the slope of the ground surface on either side of Jim's Gas Station.
2. Estimate the slope of the water table at Jim's Gas Station.
3. Infer the direction toward which the pollution plume will move.
4. Identify the houses and bodies of water that are threatened by this pollution plume.
5. Conclude Prepare a written statement to present to the local community. Explain
the path the plume is predicted to take, and how this was determined.
1. The slope of the ground surface on either side of Jim's Gas Station calculated using altimeter.
2. The slope of the water table at Jim's Gas Station the depth of the water table varies in relation to the topography.
3. The direction toward which the pollution plume will move downward away from the gas station
4. The houses and bodies of water are more likely to be impacted by the pollution plume the farther downhill they are.
5. A precise forecast of the plume's path can be made by taking into account all of these variables.
A topographic map is what?An example of a map type that uses contour lines to show the shape of the land and its features is a topographic map.
1. An elevation survey would need to be conducted to ascertain the change in elevation in relation to the distance traveled in order to calculate the slope of the ground surface on either side of Jim's Gas Station. An altimeter or a topographic map can be used for this.
2. By measuring the depth of the water table in relation to the local topography, one can determine the slope of the water table at Jim's Gas Station. To do this, measure the water table depth at various locations close to the gas station, plot the results, and then determine how the depth of the water table varies in relation to the topography.
3. By observing the slope of the ground surface and water table, it is possible to determine the direction of the pollution plume. The pollution plume is likely to move in the same direction if the ground surface slopes downward away from the gas station.
4. This pollution plume is most dangerous to the homes and bodies of water that are situated below the gas station. Homes and bodies of water are more likely to be impacted by the pollution plume the farther downhill they are.
5. By observing the slope of the ground surface and water table, it is possible to predict the direction of the pollution plume at Jim's Gas Station. This is due to the fact that the pollution plume will travel in the direction of the water table's and ground surface's downward slope. By considering additional elements like wind speed and direction, temperature, and humidity, the plume's path can be more precisely determined. A precise forecast of the plume's path can be made by taking into account all of these variables.
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How have animals in the arctic and alpine tundra biomes adapted to survive in the harsh climate?
To live in this severe climate, animals have developed several adaptations. In the Tundra, animals require shelter and insulation. The animals in this area have thicker, warmer feathers and coats.
Many of them have bigger bodies and shorter limbs, legs, and tails, which aids in heat retention and prevents heat loss.
Alpine animals react to cold temperatures by hibernating, moving to warmer climates, or insulating their body with layers of fat and fur. To decrease heat loss, their bodies feature shorter legs, tails, and ears. Plants have also adapted to the Arctic tundra by gaining the capacity to grow beneath a covering of snow, perform photosynthesis in extremely low temperatures, and so on.
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the __________ is the dense connective tissue that surrounds each testis.
The tunica albuginea, is the dense connective tissue that surrounds each testis.
Tunica albuginea is the hard fibrous layer of connective tissue that surrounds the corpora cavernosa of the pe-nis. The foremost issues that impacts this tissue is a benign, obtained wound-restoration connective tissue sickness referred to as Py-ronies sickness that impacts approximately 3 to 9 percentage of men . The tunica albuginea (TA) paperwork the fibrous overlaying of the testis and is itself blanketed via way of means of the serous layer, the tunica vaginalis. The overlaying is total, besides for on the factor of attachment of the epididymis, and a small disorder posteriorly wherein the spermatic twine vessels input and go away the testis.
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interphase has 20 cells, prophase has 10 cells, metaphase has 3 cells, anaphase has 2 cells, telophase has 1 cell, what percent does each of them have total has to be 100%. how many minutes does each phase take total has to be 720 minutes.
Interphase has 20 cells, prophase has 10 cells, metaphase has 3 cells, anaphase has 2 cells, and telophase has 1 cell, so the interphase has 100%, the prophase has 50%, the metaphase has 15%, the anaphase has 10%, and the telophase has 5%, while each phase will take 144 minutes.
What is the significance of each phase?The cell division takes place in order to divide the cells into either two or four cells, and here the total cells are 20, so as per that, the cells in each phase are derived, and taking the total phase of the cell division, which is 5, and dividing it with the total minute, which is 720, and multiplying with the number of times the phase takes place, the result is 144.
720/5×1=144
Hence, interphase has 20 cells, prophase has 10 cells, metaphase has 3 cells, anaphase has 2 cells, and telophase has 1 cell, so the interphase has 100%, the prophase has 50%, the metaphase has 15%, the anaphase has 10%, and the telophase has 5%, while each phase will take 144 minutes.
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What two conditions must be present for osmosis to occur?
Group of answer choices
1. equal solute concentrations on both sides of a membrane
2. disrupted membrane
3. high solute concentrations
4. a membrane that allows only solute to pass, but not the water
5. concentration gradient between the two sides of a membrane
6. low solute concentrations
7. a membrane that allows only water to pass, but not the solute
8. a membrane permeable to all molecules
Osmosis can only take place when the membrane is permeable to water but impermeable to the solute, and when the concentration of the solute on the two sides of the membrane differs.
What happens during osmosis?Osmosis is the process by which a solvent moves between two solutions with different solute concentrations over a semipermeable membrane. The solvent is transferred from the solution with the concentration of solutes to the solution with the greater solute concentration during osmosis.
What function does osmosis serve?The main mechanism for bringing water from and into cells is osmosis. Osmosis between a cell's interior and its comparatively hypotonic surroundings regulates a cell's turgor pressure in significant part.
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