B cells that produce and release large amounts of antibodies are called:

Correct Answer: C

Rationale: Plasma cells secrete antibodies; memory cells persist, basophils release histamine.

Correct Answer: D

Rationale: Bone marrow-derived and thymus-derived (T) lymphocytes somatically generate receptors during development. Unlike natural killer cells, B cells and T cells are unable to assess the quantity of MHC class I molecules on nucleated cells. Unlike innate immune system receptors, B- and T-lymphocyte somatic receptors are randomly generated and vary greatly between individuals. B- and T-lymphocytes receptors are formed prior to antigen stimulation.

Correct Answer: A

Rationale: An adjuvant enhances immune responses to antigens, unlike haptens (need carriers) or antiserum (contains antibodies).

Correct Answer: B

Rationale: A single hematopoietic stem cell gives rise to all blood cells, including red and white, not separate progenitors.

Correct Answer: D

Rationale: MHC proteins are HLA in humans; not ABC , HIV , or Ig .