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.
4. Removing a phosphate group from an ATP molecule. I hope this what you need for the answer and I hope it helps! Have a great day!
The three R's- reduce reuse and recycle all help cut down on the amount of waste we throw away. they conserve natural resources, landfill space and energy, plus, the three R's save land and money communities must use to dispose of waste in landfills
The genome of prokaryotic is organisms tht is generally a circular, or double-stranded piece of DNA, which multiple copies that may exist at any time.
Answer:
The correct answer will be option- Increase in cAMP
Explanation:
Epinephrine is the hormone which is secreted during the stress conditions which prepares the body for fight or flight response. The epinephrine for flight activates the cAMP pathway in the muscles which leads to the activation of glycogenolysis process.
The epinephrine hormone binds the receptors in the muscles which convert ATP to cAMP. The cAMP bind to inactive PKA and activate it. The activated PKA converts the Phosphorylase b which activate the glycogen phosphorylase a which converts the glycogen to glucose 6 phosphate.
Thus, option- Increase in cAMP is the correct answer.
