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wolverine [178]
3 years ago
7

Select the best description of the negative selection process of lymphocyte maturation.

Biology
1 answer:
Studentka2010 [4]3 years ago
5 0

Answer:

B) removal of lymphocytes that react with "self" cells

Explanation:

By negative selection, we mean to say that the lymphocytes which are reacting with self cells too strongly must undergo apoptosis otherwise they will cause auto-immunity which will lead to destruction of self cells.

Before negative selection, the naive lymphocytes undergo positive selection during which they are allowed to interact with MHC-I or MHC-II. This kind of selection is necessary so as to ensure that the selected lymphocytes have affinity towards MHC molecule for generation of effective immune response whenever it is required. All those cells that do not recognize self antigen undergo apoptosis because they are useless and the lymphocytes which recognize MHC moderately are selected for the next stage which is negative selection.

Once these lymphocytes have passed test for positive selection, they have to undergo test for negative selection. All those lymphocytes which are interacting very strongly with self antigen are rejected and finally undergo apoptosis.

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A 154-lb adult man performs a moderate level of physical activity and regularly consumes 2700 Calories a day. State whether the
Arte-miy333 [17]

Answer:

The correct answer would be - remain the same.

Explanation:

In the given table showing the average daily calories requirement according to the weight of the adult men. Which is as follows:

weight                daily intake

132                        2250

154                        2450

176                        2650

198                        2850

220                       3050

242                       3250

In this, the highlight weight and required calories should be taken by the man who does not perform any physical exercise but according to the question a man with 154 lb perform a moderate exercise, and according to the CDC a 154 lb men can burn anywhere between 140 and 295 calories in 30 minutes by moderate exercise for an hour.

Thus, the total calories he takes: 2700

burn by exercise: 295

should take: 2450

then = 2700 - (2450+295)

= 50 calories over the limit that will have negligible effect on the weight.

6 0
3 years ago
2. use the atomic number and atomic mass to indicate the number of subatomic particles​
lawyer [7]

Answer:hydrogen atomic no and mass no is 1. In hydrogen there is one electron ,one proton and zero neutron.

Explanation:

Neutron is zero because neutron

Nnumber =atomic no - mass no so 1-1=0.

4 0
3 years ago
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velikii [3]

Answer:

1. Signaling molecule

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Explanation:

Hormones, growth factors, neurotransmitters, etc. serve the function of signaling molecules for cells. These molecules are released by one cell and bind to the receptors present on/in the target cells to elicit the desired response. Thereby, the signaling molecules serve in cell-cell communication.

For example, insulin hormone synthesized and released from beta cells of pancreas binds to its cell surface receptors present on the surfaces of liver cells and muscle cells to stimulate the uptake of the glucose from the blood.  

Likewise, neurotransmitters released from the presynaptic neuron bind to receptors present on the membrane of postsynaptic neuron and serve to carry the nerve impulse to the postsynaptic neuron.  

8 0
3 years ago
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Lelechka [254]
The answer would be B. Unorganized deposits of rock and sediment. Hope this helps. :)
3 0
4 years ago
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7 0
4 years ago
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