Why is clonal expansion so important?a. to select for specific cellsb. to secrete cytokinesc. to kill target cellsd. to increase the numbers of specific cells

of the choices, which cells stimulate directly B cells to divide and produce antibodies? a. mast cells b. marcophages c. Nk cells d. TH cells

The MHC structure is critical for... a. Natural Killer Cells to identify healthy cells b. T cells to become activated c. B cells to get activated d. Histamines to function

If a centrocyte does not interact with antigen and engage CD40 shortly after its derivation, then Select one: a. it recommences somatic hypermutation b. it undergoes apoptosis C. it moves back into the dark zone of the germinal center and switches its isotype d. its surface immunogloblulin levels decrease and proliferation recommences.