Question

9.Myeloid cells produced from haemapoietic stem cells will all be white blood cells.

Select one:

True

False

10.

Which of the following statements is true?

Select one:

a. Infected body cells are an example of antigen presenting cells (APCs).

b. A CD8+ T cell will bind to intact pathogens circulating in the blood.

c. Phagocytes only destroy virally-infected cells.

d. In the absence of an antigen, a B cell incubated with Th cytokines will proliferate into memory B cells and plasma cells.

e. Antigen presenting cells (APCs) are phagocytes that are needed to activate CD4+ T cells.

Answer 1

9. Myeloid cells produced from haemapoietic stem cells will all be white blood cells.

Correct option: False

Justification: This is false because myeloid cells produced from haemapoietic stem cells will not be only all the white blood cells but also RBC, platelets and monocyte will be produced from the myeloid cell.

10. Which of the following statements is true?

Correct option: e. Antigen-presenting cells (APCs) are phagocytes that are needed to activate CD4+ T cells.

Justification: This is the correct option because CD4+nT cells will only bind to the MHC-II processed antigen processed by the antigen-presenting cells.

Reason for incorrect options:

a. Infected body cells are an example of antigen-presenting cells (APCs).

Reason: This is incorrect because APCs includes macrophage, dendritic cell and B- cells not all the infected body cells.

b. A CD8+ T cell will bind to intact pathogens circulating in the blood.

Reason:This is incorrect because CD8+ T cell will bind to MHC-I processed antigen, it means  CD8+ T cell will not bind to intact pathogens circulating in the blood.

c. Phagocytes only destroy virally-infected cells.

Reason:This is incorrect because phagocytes can destroy both bacteria and virus as well as infected cells, so phagocytes do not only destroy virally-infected cells.

d. In the absence of an antigen, a B cell incubated with Th cytokines will proliferate into memory B cells and plasma cells.

Reason:This is incorrect because B cell needs antigen in order to proliferate into memory B cells and plasma cells when incubated with Th cytokines.