CLEP CLEP Biology Microbiology and Immunology 2

Question 1

Which cells are responsible for producing and secreting antibodies?

Accepted Answer

Plasma cells

Answer

Plasma cells are fully differentiated B lymphocytes that produce and secrete large amounts of antibodies specific to a particular antigen.

Question 2

What is the primary function of MHC Class I molecules?

Accepted Answer

Presenting intracellular antigens to CD8+ cytotoxic T cells

Answer

MHC Class I molecules present intracellular peptide antigens to CD8+ cytotoxic T cells, signaling them to kill infected or cancerous cells.

Question 3

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

Accepted Answer

IgG

Answer

IgG is the most abundant serum antibody and crosses the placenta to provide passive immunity to the developing fetus and newborn.

Question 4

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

Accepted Answer

V(D)J recombination

Answer

V(D)J recombination randomly combines variable, diversity, and joining gene segments during B cell development to create diverse antigen-binding sites.

Question 5

Which complement pathway is activated by antibody-antigen complexes?

Accepted Answer

Classical pathway

Answer

The classical complement pathway is initiated when C1q binds to antibody-antigen complexes, triggering a proteolytic cascade that destroys pathogens.

CLEP Practice Test

CLEP Practice Test

CLEP CLEP Biology Microbiology and Immunology 2