CLEP CLEP Biology Microbiology and Immunology 2

Question 1

Which cells are responsible for producing and secreting antibodies?

Accepted Answer

Plasma cells

Answer

T helper cells

Answer

Cytotoxic T cells

Answer

Natural killer cells

Question 2

What is the primary function of MHC Class I molecules?

Accepted Answer

Presenting intracellular antigens to CD8+ cytotoxic T cells

Answer

Presenting antigens to CD4+ T helper cells

Answer

Directly activating B cells

Answer

Stimulating natural killer cells to divide

Question 3

Which immunoglobulin class is most abundant in serum and is the only antibody that crosses the placenta?

Accepted Answer

IgG

Answer

IgA

Answer

IgM

Answer

IgE

Question 4

Which process allows developing B cells to generate highly diverse antibody specificities?

Accepted Answer

V(D)J recombination

Answer

Mitosis

Answer

Transcription

Answer

DNA methylation

Question 5

Which complement pathway is activated by antibody-antigen complexes?

Accepted Answer

Classical pathway

Answer

Alternative pathway

Answer

Lectin pathway

Answer

Properdin pathway

Question 6

Vaccines confer protection primarily by:

Accepted Answer

Stimulating memory cell formation without causing disease

Answer

Killing pathogens before they enter the body

Answer

Increasing phagocyte activity in tissues

Answer

Blocking pathogen entry at mucosal surfaces