The surface of the villi in the small intestine is covered by a single layer of epithelial cells called enterocytes. Enterocytes absorb nutrients from the intestinal lumen as they move up the side of the villus. The enterocytes are shed from the end of the villus through apoptosis after 3 to 4 days. Consequently, new cells must be continuously supplied from the crypt and move up the villus. When a stem cell in the crypt divides, what are its immediate daughter cells

Answers

Answer 1

Answer:

either a stem cell or a specialized cell, such as an enterocyte


Related Questions

In Guinea pigs, short hair (S) is dominant over long hair (s), and black coat color (B) is dominant over
albino (b). Both genes assort independently. A female of a true breeding line with a black coat and long
hair is mated with a short haired albino male (also from a true breeding line). (a) What are the
phenotypes of the F1 generation? Explain. (b) If F1 is mated, which percentage of the offspring will be
homozygous for both characters? Give all genotypes and phenotypes of these homozygotes.​

Answers

Answer:

Explanation:

Short hair (S) is dominant over long hair (s), and black coat color (B) is dominant over albino (b).

A female of a true breeding line with a black coat and long  hair is mated with a short haired albino male (also from a true breeding line)

parents genotype      BBss  x    SSbb

gametes                       Bs     x    Sb

F1 generation geenotype    BbSs

Phenotype- They are all with black coat and short hair

Mating of F1   BbSs  x  BbSs

   Percentage of offspring homozygous for both characters:

  Bb  x   Bb           Ss   x   Ss

 BB Bb Bb bb     SS  Ss Ss ss

 1/4             1/4         1/4       1/4

1/4*1/4 = 1/16 = 0.0625 = 6% for each homozygous characters (BBSS-6% and bbss-6%)

The genotypes of the homozygotes are BBSS and bbss

The phenotype of BBSS is black coat with long hair

The phenotype of bbss is an albino with short hair

How dose natural selection lead to evolution

Answers

Answer:

Naturally selected organisms will survive and reproduce better adapted to the environment. This indicates that this model organism's beneficial allles are passed to offspring. The selection cycle contributes to adaptation for several years.

Explanation:

Hope this helps.

Plant species A cannot fight most fungal infections, while plant species B makes a protein that kills many fungi.
What is one possible way for humans to engineer species A plants that can produce the fungus-killing protein?

Answers

Answer:They can insert the gene for the protein from species B into a chromosome in species A.

Explanation:

The one possible way for human to engineer species should be that it should insert the gene for the protein.

What is fungal infections?

It is known as the mycosis that represent the disease on the skin that should be caused by the fungus. There are various kind of species of fungi. It should be lived on dirt, on plants, or the surface on the household and even on the skin. It would leads into the rashes or bumps in the skin problem

Therefore, The one possible way for human to engineer species should be that it should insert the gene for the protein.

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You prepare an agar plate by spread plating & place an antibiotic disk in the middle of the plate. After incubating for a day at 37 degrees C, there are no bacteria on the plate. Which of the following is NOT a reasonable interpretation of what might have happened?
O The bacteria in the culture tube were already dead when you made the plate
O The medium used was defective and provided no nutrition for the bacteria
O The bacteria grew all over the plate but were then killed by the antibiotic
O The spreading tool was too hot when spreading the bacteria

Answers

Answer:

A.The bacteria in the culture tube were already dead when you made the plate

Explanation:

Antibiotics are the chemical substance used to kill or stop the growth of bacteria and some other microorganism.

Antibiotics are added to agar plate during experiment for the selection of only those bacteria with resistance to that antibiotic.

There can be several interpretation for the absence of bacteria such as:

The bacteria grows on the nutrients in the medium but due to defective medium they were unable to grow and die.It may also happen bacteria might have grown in all over the plate but due to the action of antibiotic, all the bacteria got killed.Tool used for spreading might kill bacteria as it was hot and bacteria may not be able to tolerate the excessive heat and die.

Hence, the only not reasonable interpretation is bacteria in the culture tube were already dead when you made the plate.

So, the correct option is A.

Within a population of butterflies, the color brown (B) is dominant over the color white (b) and 32% of all butterflies are white. Given this simple information, which is something that is very likely to be on an exam (teehee), calculate the following:
1. The percentage of butterflies in the population that are homozygous dominant
2. The number of heterozygous butterflies if the population contained 4,216 individuals

Answers

Answer:

48% Heterozygous of the population, 12% Homozygous dominant size.

Explanation:  

Given the characteristics of its population,

Brown (B) predominates over white (b) color.

Recessive phenotype frequency (Q)= 40%= 0.4

According to the Hardy-Weinberg principle, the frequency is given by P and Q for a population with the dominant and recessive trait, where P+Q=1 preserves the equilibrium of the population allele.

So then, P = 1-Q

P=1-0.4=0.6

Heterozygotic butterflies = 2PQ

So, 2PQ= 2x0.6x0.4=0.48

That is, 48 percent of people are heterozygous

Homozygous dominant individual frequency = 1-(40 + 48) = 12 i.e. 12%

Answer:

C. 0.48

Explanation:

What explains why populations fluctuate around the carrying capacity?

Answers

Answer:

In population ecology: Population fluctuation As stated above, populations rarely grow smoothly up to the carrying capacity and then remain there. Instead, fluctuations in population numbers, abundance, or density from one time step to the next are the norm.

The carrying capacity of an environment is the maximum population size of a biological species that can be sustained in that specific environment, given the food, habitat, water, and other resources available. In population ecology, carrying capacity is defined as the environment's maximal load, which is different from the concept of population equilibrium, which may be far below an environment's carrying capacity. The effect of carrying capacity on population dynamics may be modelled with a logistic function.

The populations fluctuate around its carrying capacity because it is very common even for a stable population to briefly exceed or dip below its carrying capacity.

The size of the population fluctuate due to some environmental factors, presence of predators, competitors etc.

Also reproductive lag time can also cause the population to exceed the carrying capacity temporarily.

What is carrying capacity?

The carrying capacity of an environment is the maximum population size of organisms that can be supported by the ecosystem, given the food, mates, shelters and other resources available.

What is reproductive lag time?

Reproductive lag time is the time required for birth rate to decline and the death rate to increase in response to resource limits.

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A DNA molecule is made up of building blocks known as nucleotides. Each nucleotide consists of deoxyribose, a phosphate group, and one of the chemical bases. The nucleotides join together to form a
, which form the backbone of a DNA strand.

Answers

Answer:

polynucleotide

Explanation:

according to edmentum notes, "The nucleotides join together to form a polynucleotide. Polynucleotides form the backbone of a DNA strand.'

Nucleotides are the building units of the DNA or RNA molecule. DNA is composed of deoxyribose, a phosphate group, and one of the chemical bases that make up each nucleotide.

What is a nucleotide?

It is a monomer of DNA or RNA. It is composed of a sugar (deoxyribose in DNA ribose in RNA), a phosphate group, and one of the chemical bases that make up each nucleotide.

The backbone of DNA is formed by which components?

It is formed of sugar and phosphate only.

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What type of acid is currently of principal concern when dealing with acid rain?

Answers

Answer: Sulfur dioxide (SO2) and nitrogen oxides (NOx) released into the air by fossil-fuel power plants, vehicles and oil refineries are the biggest cause of acid rain today, according to the EPA. Two thirds of sulfur dioxide and one fourth of nitrogen oxide found in the atmosphere come from electric power generators

hope this helps

based on the scientists results, which of the following is true?

Answers

Well there’s no options

4. Is predation a density-dependent or density-independent factor?

Answers

Answer:

The correct answer is density-dependent factor.

Explanation:

The factors whose influences on the growth or size of the population changes with the density of the population are known as the density-dependent factors. The availability of food, disease, predation, and migration are some types of density-dependent limiting factors.  

One of the density-dependent factors in nature is predation, predation confines various populations. The population of the prey and the predator encircle towards each other, with the population of the predator somewhat lagging behind the population of the prey.  

With the increase in the population of the prey, the predator gets more to eat, and thus the population of the predator increases. With the increase in the predator population, pressure imparts on the prey population and it starts to decline. The decline in the availability of the food eventually makes the population of the predator to decline. Therefore, it can be seen that both the population of the prey and the predator are affected by predation, that is, a density-dependent factor.  

DPIP was used in the photosynthesis lab to measure the

-Light dependent reactions

-Production of O2

-Light Independent reaction (a.k.a. Calvin cycle)

-Production of CO2

Answers

Answer:

Light dependent reactions

Explanation:

DPIP stands for Dichlorophenolindophenol. It is a chemical compound that is used as a redox dye.

DCPIP is blue when it is oxidized DCPIP is colorless when it is reduced.

DCPIP measures the rate of photosynthesis. The redox dye is decolorized by chemical reduction when it is exposed to light in the process of photosynthesis.

DPIP was used in the photosynthesis lab to measure the light dependent reactions.

Which is a possible path of the movements of nitrogen in the nitrogen cycle?
(A) soil - airplants air animals - soil
B) soil animals plants
soil
animals soul plants - air
(D) air - soil plants animals soil - air​

Answers

Answer:

B) soil animals plants

soil

Explanation:

Nitrogen is taken up by plant roots and combined into organic substances in the plant, such as enzymes, proteins and chlorophyll. ... Plant and animal wastes decompose, adding nitrogen to the soil. Bacteria in the soil convert those forms of nitrogen into forms plants can use. Plants use the nitrogen in the soil to grow.

The process through which humans breed other animals and plants for particular traits:
A) artificial selection
B) genetic engineering
C) genes
D) selective breeding
E) traits

Answers

Answer:

A) artificial selection

Why is it important for Scientists to develop a way to grow tissues that have built-
in system to supply
blood?

Answers

It is important for scientists to develop a way to grow tissues that have a built-in system to supply blood? A lack of blood flow determines the number of cell layers that can survive when they are transplanted. A lack of blood flow determines the types of tissues that can be grown in culture.

Answer:

ghgcktv bm

Explanation:

bvkgufchyjb

Learning the rights, obligations, and expectations of a role to prepare for assuming that role in the future. ???

Answers

Answer:

Explanation: Anticipatory socialization involves learning the rights, obligations, and expectations of a role to prepare for assuming that particular role in the future

The process of learning the rights, obligations, and expectations of a role to prepare for assuming that role in the future is known as anticipatory socialization.

What is socialization?

The term socialization refers to the rigorous process of acquiring the behavior pattern that enables a person to perfectly fit into the society of which he/she is an integral part of.

The term anticipatory socialization refers to the learning of the rights, obligations, and expectations of a role to prepare for assuming that role in the future.

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1. Which plant traps bugs in its stem and forces them to walk forward?

Answers

Explanation:

The active trap in the Venus Flytrap ( dionaea muscipula )

explain the process (reflex action) that happens when you pull your arm away from an open flame. use steps to explain your answer. identify the receptor in the skin, the stimulus, the neurons,the effector(muscle) and the body's response to the stimulus.

Answers

Answer:

A reflex action is defined as an involuntary action of body in response to a stimulus, which protects the body from any harmful conditions including touching open flame.

A reflex action follows a sequence of action that helps in involuntary action, tha include the stimulus, receptor in the skin, the neurons (sensory, relay and motor neurons), the effector(muscle) and resposne of body to stimulus.

In the reflex action when a person pull his/her arm away from an open flame, the stimulus will be the hot flame that send a signal to the nervous system.

The sensory receptor found in the dermis or epidermis of skin called cutaneous receptors, senses the temperature change.

Then the sensory neuron comes in action which sends electrical impulses to a relay neuron (located in spinal cord) and relay neuron sends impulse to motor neuron.

Motor neuron sends that electrical impulses to a muscle which act as an effector which allows muscle to contracts to move hand away.

So, at the end the body resposnes to move hand aways from the open flame.

Which of the following relationships may present harm to one of the organisms involved?

I. Commensalism
II. Parasitism
III. Predation
IV. Mutualism

(A) I and II only
(B) I and IV only
(C) II and III only
(D) III and IV only​

Answers

Answer:

C

Explanation:

Predator-Prey relationship

If all of the red squirrels were diseased and died off what would happen to this food web?

Answers

there would be a increase of Sitka spruce and a slight decrease of Martens.

which species is the banana most closely related to?
lemon
onion
radish
seaweed

Answers

Answer:

onion

Explanation:

"Onions are most closely related to a) banana. Onions are part of the Amaryllidaceae family and bananas are part of the Musaceae family. They are both monocots, meaning the have one cotyledon, parallel leaf veins, and flower petals in multiples of three, among other distinctive characteristics. "

Answer:

Onions are most closely related to a) banana. Onions are part of the Amaryllidaceae family and bananas are part of the Musaceae family. They are both mono cots, meaning the have one cotyledon, parallel leaf veins, and flower petals in multiples of three, among other distinctive characteristics.

Hope this helps!

Please give as brainliest answer!!

Thanks!

Explanation:

What happens during interphase that allows the two resulting cells to be the same as the
original cell?

Answers

Answer:

During mitosis, a eukaryotic cell undergoes a carefully coordinated nuclear division that results in the formation of two genetically identical daughter cells. ... Then, at a critical point during interphase (called the S phase), the cell duplicates its chromosomes and ensures its systems are ready for cell division.

Unscramble the word - oicnoecm mptcia earth science please

Answers

I want to say

Economic impact (?)

Answer:

The answer is Economic impact.

Natural selection is an evolutionary mechanism by which

Answers

Answer:Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.

Natural selection is the natural act in which nature picks and chooses who lives and who dies.

How is food moved through the gut?
a. By peristalsis c. By waves of liquid
b. By gravity
d. Movement​

Answers

Explanation:

a. By peristalsis

..................

Which of the following statements about oxidative phosphorylation by ATP synthase is FALSE? A) The electrochemical gradient across the inner mitochondrial membrane generated by electron flow is used to synthesize ATP. B) Uncouplers dissipate the electrochemical gradient but electron transport continues without ATP production. C) Inhibitors disrupt electron flow as well as ATP synthesis. D) A proton gradient alone without a corresponding energy input is not sufficient to drive the synthesis of ATP. E) ATP synthesis occurs via simultaneous conformational changes in protein subunits containing catalytic sites.

Answers

Answer

D)A proton gradient alone without a corresponding energy input is not sufficient to drive the synthesis of ATP

Explanation:

Oxidative phosphorylation reffers to metabolic pathway whereby enzyme is used by the cell to achieve nutrient oxidation, so that chemical energy of molecular oxygen is released as a result of this, adenosine triphosphate (ATP) is manufactured. oxidative phosphorylation is seen in all organisms that are aerobic in nature and it occur in the mitochondria of all eukaryotic organisms. There is electron transfer during oxidative phosphorylation, the electrons moves from the donor to the receptor and this is known as redox reaction, as a result of this energy is released, and this energy is used for formation of ATP.

Therefore,among all the options, A proton gradient alone without a corresponding energy input is not sufficient to drive the synthesis of ATP is the false statement.

The equation AU = Q - W describes which one of the following?
O A. Second law of thermodynamics
O B. Efficiency of a heat engine
O C. Work done by a gas
O D. First law of thermodynamics
SUBMI

Answers

Answer:

D. First law of thermodynamics

Explanation:

The first law of thermodynamics refers that energy can be tranferred or changed form one form to another but it can neither be destroyed nor be created. hence, it is also known as law of conservation of energy.

The equation  ΔU = Q − W describes the first law of thermodynamics.

Where

U is the internl energy of the system.                                  ΔU is the change in U.                                                          Q refers to the total heat supplied into the system (include both addition and release of energy in the system).               W is the net work done by the system.

Hence, the correct option is D.

Answer:

Option D, First law of thermodynamics

Explanation:

The first law of thermodynamics states the following -

[tex]dU = Q-W[/tex]

where dU  represents the Heat added to the System

Q represents the Change in Internal Energy OR net heat transfer OR sum of all heat transferred into and out of the system

W represents the Work done on the system

The first law of thermodynamics is based on the application of the conservation of energy principle to heat and thermodynamic.  

hence, option D is correct

Select the statements that accurately describe endocytosis.

a. The cell forms proteins that move substances into the cell against a concentration gradient.

b. The cell selectively filters small nutrients through specialized membrane pores.

c. The cell membrane pinches off to form an extracellular vesicle joined to the cell by filaments.

d. The cell membrane engulfs a particle in the cytoplasm and forms a vesicle around it.

e. The cell expends energy to transport materials into the cytosol.

Answers

Answer:

The correct answer is:

The cell membrane engulfs a particle in the cytoplasm and forms a vesicle around it.  (d.)

Explanation:

Endocytosis is a type of active transport, where particles such as (large molecules, parts of cells, and even whole cells) are moved into cells.

The various types of endocytosis has a common feature of:

1. invagination of plasma membrane forming pockets around the target particle.

2. the pocket pinches off from original plasma membrane

3. forming a new intracellular vesicle containing the target particle.

The different types of endocytosis includes

a. pinocytosis (cell drinking): takes in extracellular fluids

b. phagocytosis (cell eating): large solid particles are taken in by cells

c. receptor-mediated endocytosis: here, receptor proteins on the cells surface, binds to complementary proteins on the surface of the target particles before endocytosis occurs.

as a human population grows, what happens to our natural- resources requirement

Answers

Answer:

Need for natural resources increase

Explanation:


Check all the boxes where the vocabulary word correctly matches its
science definition?
Equilibrium: a system where forces are in balance
O
Climax community: the end of a succession resulting in a stabilized community
o
Succession: the act of winning in life
Primary Succession: colonization of an area that has not been previously occupied by
a community, e.g. newly exposed rock
Pioneer Species: the first organisms to live on rocky surfaces, e.g. lichens, moss,
algae, and fungi
Secondary Succession: colonization following a major disturbance, such as a fire or a
flood

Answers

Answer:

Climax community, primary succession, pioneer species, secondary succession.

Explanation:

Equilibrium with regards to succession occurs as "a state of dynamic equilibrium in a community of organisms in which genetic, species and ecosystem diversity remain relatively stable, but this factors are subject to gradual changes through natural succession."

Succession: the process by which the structure of a biological community evolves over time.

Which of these is found within all cells?
Organ systems
Organs
Tissues
Molecules

Answers

Answer:

tissues

Explanation:

cells make tissues and tissues make organs

Other Questions
a. Using the pairs of values for all 10 points, find the equation of the regression line. b. After removing the point with coordinates (2 comma 2 ), use the pairs of values for the remaining 9 points and find the equation of the regression line. c. Compare the results from parts (a) and (b). 0 2 4 6 8 10 0 2 4 6 8 10 x y A scatterplot has a horizontal x-scale from 0 to 10 in increments of 1 and vertical y-scale from 0 to 10 in increments of 1. Ten points are plotted with nine points, (5, 5), (6, 5), (7, 5), (5, 6), (6, 6), (6, 6), (7, 6), (5, 7), (6, 7), and (7, 7), forming a square and the tenth point (2, 2) being below and to the left of the square. a. What is the equation of the regression line for all 10 points? ModifyingAbove y with caretequals 1.647plus 0.706x (Round to three decimal places as needed.) b. What is the equation of the regression line for the set of 9 points? ModifyingAbove y with caretequals 6 (Round to three decimal places as needed.) c. Choose the correct description of the results below. A. The removal of the point has a significant impact on the regression line. B. The regression line changes, but the change is small. C. There is no regression line for the second case because the data are in a pattern. D. The regression line is very similar in both cases. What are the negative consequences of underage teens using heroin? There are 5 slices of pepperoni pizza, 1 slice of sausage pizz, and 3 slices of cheese pizza left at the pizza party. Without looking, Amy took a slice of pizza, ate it, and then took another slice. What is the probability of Amy eating two slices of cheese pizza? Do liquids have higher coefficients of expansion than solids do What role did the Sino-Japanese War play in the Chinese civil war? I WILL MARK BRAINIEST IF ANSWERED. The Coercive Acts:A. shut down the Massachusetts legislature.B. prevented colonists from suing royal officials.C. closed Boston Harbor.D. all of the above Complete the following ratios: what systems do you use when you have a scrape knee what instrument family is the aulos from What was the decade of television?1940s1950s1960s1930s Can someone answer this question please please help me I really need it if its correct I will mark you brainliest . One advantage of the decision making process is that it helps to weigh options. Please select the best answer from the choices provided T F What is the most likely reason that Kentucky was the first territory that had a population sufficient to apply for statehood? a. It had the best farmland. b. It was closest to the Appalachians. c. It was accessible since pre-Revolutionary times. d. There was less conflict with Native Americans there. The ratio of the angles in a triangle is 2:3:4. What is the measure of the largest angle?30608020 What is definition of national Literature? why did the british meet with less opposition in the southern colonies What is the rank of Brazil. (Percentile wise) What does the expression n+3 represent?? Read the excerpt. Is it moving at a fast pace or a slow pace? Support your answer with details from the text.The sun rose over the ocean like it was stretching out its arms. The golden yellow filled the sky and reflected off of the water. Birds flew slowly in the air, enjoying the morning warmth before it became too hot. Traci tries to teach her younger sister how to draw a rectangle. Traci tells her." Draw a shape with four straight sides." Traci sister draws the shape shown. The drawing of the shape includes 4 straight sides, but it is not a rectangle. How can Traci make her directions more clear?