Which statement about the specific immune response is FALSE?
Each T or B cell has antigen receptors for only one specific antigen.
T and B cells recognize antigens by using antibodies bound to their surface membranes.
Unique antigen receptors are created by genetic recombination.
Antigens must be presented by an MHC molecule for T and B cells to recognize them.
All cells express MHC-I molecules, but only antigen-presenting cells express MHC-II molecules.

Answers

Answer 1
Statement b is incorrect because the B cells are the only ones that produce antibodies which does apply for the T cells

Related Questions

6. Which objects are listed in order of scale from smallest to largest?
Sun, red giant, Earth, galaxy
red giant, Sun, galaxy, Earth
Earth, Sun, red giant, galaxy
galaxy, Earth, Sun, red giant

Answers

Third one, earth sun redgiant galaxy

how does the flow rate through capillaries affect the gas exchange rate between the blood in capillaries and interstitial fluid?

Answers

Answer:

the gas starts to bow

Explanation:

The flow rate through capillaries affect the gas exchange rate between the blood in capillaries and interstitial fluid by gas starts to blow.

What is interstitial fluid?

In terms of nutrition, interstitial fluid serves as a sort of refueling station for our cells. Salt, fatty acids, glucose, and minerals like calcium, magnesium, and potassium are all present in interstitial fluid.

Blood capillaries are where the nutrients in interstitial fluid are obtained. Additionally, metabolic waste products can be stored in interstitial fluid.

A continuous glucose monitor will use a formula to offer a near estimate of what our blood glucose level is likely to be at that particular moment because the glucose level in interstitial fluid is not exactly the same as that in our blood.

Therefore, The flow rate through capillaries affect the gas exchange rate between the blood in capillaries and interstitial fluid by gas starts to blow.

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1. Describe how chemical changes
are
different from physical changes.

Answers

Answer:

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.

Explanation:

Answer:

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. In a chemical change, the kind of matter changes, and at least one new substance with new properties is formed.

Explanation:

Physical changes are limited to changes that result in a difference in the display without changing the composition.

hope that helped!

PLEASE HELP ME IM TIMED!

Answers

Answer:

D

Explanation:

Actually fat is the best source of energy, since it is time consuming to break down a molecule of fat, carbohydrate is now used as an alternative to that since the molecules are broken down quicker.

a critical event in the death of a cell is caused by

Answers

Answer:Apoptosis and autophagy are both forms of programmed cell death. Necrosis is the death of a cell caused by external factors such as trauma or infection and occurs in several different forms.

Explanation:

why is Ten dollars and Ice not a kinetic energy ?

Answers

Answer: They aren't kinetic energy

Explanation: They are not because it is either motionless or at rest.

what is the texture of a butterfly wing.​

Answers

Answer: soft, chalkey

Explanation: .

Which chromosome pair shows gender?

1


15


22


23

Answers

Answer:

23

Explanation:

which of the following is a way that human modification of limiting factors causes unbalance in ecosystems? a. habitat loss b. pollution c. climate changes d. all of the above

Answers

Answer:

D all of the above

Explanation:

The way that human modification of limiting factors causes imbalance in the ecosystem is : ( D ) All of the above

What are limiting factors

Limiting factors are factors contraining the growth of a population in an ecosystem. the modification by humans on these limiting factors causes an imbalance in the ecosytem which leads to loss of habitat, pollution and climate changes.

Hence we can conclude that The way that human modification of limiting factors causes imbalance in the ecosystem is : ( D ) All of the above.

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When muscle tissue is exercising under anaerobic conditions, the production of ______ is important because it ensures a continuous supply of NAD

Answers

Given what we know about the biological mechanisms behind anaerobic exercise, we can confirm that the production of lactate ensures a continuous supply of NAD.

In order for us to undergo any physical exercise, it is imperative that we are able to produce energy within our cells. The energy used by cells is in the form of a molecule by the name of ATP, which is produced primarily through a process known as Glycolysis.

This is relevant given that in order for glycolysis to happen, a key protein is required known as NAD+. Lactate is produced from pyruvate only under anaerobic conditions because these are conditions that lack oxygen which is the only other source of NAD+, therefore, pyruvate must be converted to lactic acid to make it possible to continue glycolysis and the production of ATP.

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Do Grocery stores sell toothpaste cost?

Answers

Answer:

Yes they do sell toothpaste in grocery store because toothpaste is a essential thing we use in our daily life. The cost may vary from shop to shop. So we can not tell the cost of the toothpaste accurately.

Explanation:

Answer:

english please that made no sense but yes i do believe that stores sell toothpaste

Explanation:

How does sweating during exercise help maintain homeostasis?
a) It regulates body temperature
b) It regulates water concentration in the cells
c) It regulates transport between cells.
d) It regulates ion concentrations in the cells.

Answers

Answer:

the answer would be A, It regulates body temperature

Answer:

It regulates body temperature

Explanation:

Because homeostasis is the bodies ability to maintain a set temperature.

Label each of the components in the equation below. What type of reaction is shown in the equation? ​

Answers

Answer:

It's an esterification reaction

Glycerol + Fatty acid ---> Triacylglycerol or triglyceride

+3 water molecules

The chemical equations shown depict esterification and dehydration reactions.

What is a chemical equation?

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Why do the hydrogen ions and the hydroxide ions form bonds to make macromolecules?

Pick One of the Following:
A. They both have protons that attract to each other.
B. They each have an electrical charge that attracts to each other.
C. They both have electrons that attract to each other.

Answers

Answer:

A i think

Explanation:

which molecules bind regulatory sequences of dna to encourage positive regulation of transcription?

Answers

proteins, but specifically activator proteins :)

Does human intervention affect small-scale ecosystems differently than large-scale ecosystems?

two pieces of information along with their sources

Answers

Answer: No

According to BBC, Human activities such as harvesting plants and hunting animals can unbalance the flows and cycles within those [SMALL SCALE ECOSYSTEMS ]ecosystems. Tree-felling may lead to soil erosion and a loss of habitat. Lack of shade and moisture in the soil can result in desertification.

According to National Geographic, Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.

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Match each part of the kidney with the correct label.

Answers

Kidneys are externally surrounded by a three-layer capsule, and internally composed of the cortex, medulla, and pelvis. In the image, 1) Cortex, 2) Medulla, 3) Sinuses , 4) Capsule.

What are the kidneys?

The kidneys are bean-shaped, bilateral urinary organs located at each side of the vertebral column, under the ribs, and behind the abdomen (superior right and left abdominal quadrants).

Their main function is to filtrate blood, eliminate wastes and water excess through urine, and keep internal homeostasis.

When blood enters the kidneys, water, salts, and other waste substances are eliminated as urine, and the filtrated blood returns to the organism.

Kidneys are composed of different parts.

Externally,

Renal fascia ⇒ External layerRenal fatty capsule ⇒ Media layerRenal fibrous capsule ⇒ Internal layer

Internally,

the renal cortex ⇒ produces erythropoietinrenal medulla ⇒ contains nephrons, which filtrate blood and produce urine.renal pelvis ⇒ ilion

The medulla is arranged as pyramidal masses composed of tubular structures. In between the pyramids, there are renal papilla and calyces.

1) Cortex

2) Medulla

3) Sinuses

4) Capsule

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in which phase of the cell cycle do cells check to determine whether the dna is fully and correctly replicated?

Answers

Answer:

at the end of G2

Explanation:

What is the term used to describe homologous chromosomes exchanging genetic material during meiosis?.

Answers

The term used to describe homologous chromosomes exchanging genetic material during meiosis is called crossing over.

CROSSING OVER:

Crossing over is the process whereby non-sister chromatids of homologous chromosomes (similar but non-identical chromosomes from each parent) exchange genetic material.

Crossing over occurs in the prophase I stage of meiosis where homologous chromosomes lie side by side to form a structure called tetrad or bivalent.

Crossing over ensures genetic diversity in the offsprings produced meiosis.

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Answer:

crossing-over

Explanation:

. Tay-Sachs disease is a human genetic condition where cells build up with large, complex, and undigested lipids. Which organelle must be malfunctioning (not working) in this condition

Answers

Answer:

lysosomes

Explanation:

missing lysosomal enzyme

What is the condition in a male in which the prostate gland enlarges and compresses the urethra, causing bladder, kidney, and urinary problems?

Answers

Answer:

b. Prostatic hyperplasia

Explanation:is correct

PLZ HELP! why it is important to base scientific theories and models on empirical evidence as opposed to other ways of knowing such as religion​?​

Answers

Answer:

A theory not only explains known facts; it also allows scientists to make predictions of what they should observe if a theory is true. Scientific theories are testable. New evidence should be compatible with a theory.

Explanation:

(ii) Two grey mice, when mated, produced a total of 8 white, 9 black and 17 grey offspring. Student A suggested that grey coat colour was dominant in the mice. Student B strongly disagreed Which student is right? Explain your answer using appropriate symbols (4 marks)​

Answers

Answer: Grey color is the dominant color in this case because both parents are what color so they pass that on to the offspring and there where more grey offspring then any other

materials are cycled out by the chloroplast and mitochondrion​

Answers

Carbon dioxide, Water, Sugar And Oxygen.

_____ mimic the process of natural evolution to generate solutions to optimization and search problems.

Answers

Search algorithms are used to generate solutions to optimization and search problems.

Search algorithms that mimic the process of natural evolution. Search algorithms can be used to generate solutions to optimization and search problems using techniques such as mutation, selection, crossover, and chromosome.

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Breathing is also known as which of the following?

*Ventilation
Internal respiration
External respiration
Gas exchange

Answers

Answer:

a. Ventilation

Explanation: post protected

which statement is not true about electrical synapses?

Answers

They allow the movement of ion through desmorones

a red onion cell has undergone a change, as represented in the diagram below. This change is most likely due to the cell being placed in...

Answers

Salt water.
We can see that the cell is shrivelled meaning osmosis has taken place. So it must be salt water

A red onion cell placed in a saline solution will lose water when water moves from the cell to the surrounding hypertonic medium via osmosis, causing the cell to shrivel up.

What is osmosis?

The passage of solvent molecules from a lower concentration solution to a higher concentration solution across a semipermeable membrane. It is a passive process that occurs without the use of any energy.

Solvent molecule transfer proceeds from low to high concentration regions until the concentrations on both sides of the membrane are equal.

What are the types of osmosis?An isotonic solution contains the same solute concentration both within and outside the cell.

A hypertonic solution has a larger solute concentration outside than inside the cell.

A hypotonic solution contains a larger concentration of solutes inside the cell than outside.

Thus, we can conclude that when a red onion cell is placed in salt water.

As we can see in the diagram the onion cell shrink which means it is placed in salt water which is a hypertonic solution.

So, option (3) salt water is correct.

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b19 , b20



help!!



need answer



pls also check my other questions!

Answers

Help what is the question

What is the term for the congenital absence of the urinary bladder?

Answers

Answer:

Urinary bladder agenesis

Explanation:

Bladder agenesis may be the result of secondary atrophy of the urogenital sinus, perhaps owing to the lack of distension with urine caused by failure of incorporation of the mesonephric ducts and ureters to develop into the trigone.

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