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Dmitrij [34]
3 years ago
13

Which of the following statements about T lymphocytes is FALSE? Which of the following statements about T lymphocytes is FALSE?

T lymphocytes are called such because they mature in the thymus. There are three types of T lymphocytes. T lymphocytes produce antibody molecules. T lymphocytes have TCRs that recognize antigen only if it is bound to MHC. T lymphocytes directly attack cells and produce the cell-mediated immune response. Request Answer
Biology
1 answer:
defon3 years ago
6 0

The false statement is: T lymphocytes produce antibody molecules

B lymphocytes produce antibody molecules.

B cells and T cells or lymphocytes are both cells of the adaptive immune system. Progenitor T cells mature (start to express T cell receptors TCRs,  CD4 /CD8 receptors) into T cells in lymphoid organ-thymus. T cell can recognize only those antigens that are presented on antigen-presenting cells, on their surface MHC molecules.

There are three types of T cells: Helper T cells,Cytotoxic T cellsand T regulatory cells.

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Which of the following is not a natural cause of extinction?
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Introduction of Non-native species would be the answer. ( B )

Explanation:

Now let's break it down.

A. Competition due to overpopulation

Competition due to overpopulation, as competition of resources rises, species will fight among each other, and slowly, population will go down. But I don't see the reason of why it would cause an extinction... perhaps a decrease of population. See, once populations starts decreasing, resources will increase. And ONCE resources increase, populations starts increasing, and there goes competition. Resources decreases, populations decreases, and the whole process repeats. So I'm not quite sure whether it will cause extinction of a species.

B. Introduction of Non- native species.

So what does it mean by Non-native species?

It means that species that have no effect and doesn't exist in the ecosystem. So that will definitely not affect the population whatsoever.

C. Catastrophic Events

Well, common sense. Many people died of tsunamis, tornado and other natural disasters every year. Too many disasters can cause the population to cease.

D. Disease

This we can relate, especially the Coronavirus. Many humans died of the deadly virus. Same goes to animals. If a disease gets too deadly, population will decrease and drive the species to extinction.

So, the Answer would be B.

<h2>HOPE THIS ANSWER HELPED :)</h2>
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