Phagocytes ingest particular matter into cells for degradation. Which of the following is NOT considered a phagocyte?

Correct Answer: D

Rationale: Lymphocytes (B and T cells) are not phagocytic; they mediate adaptive immunity, unlike macrophages, neutrophils, and eosinophils which engulf pathogens.

Correct Answer: B

Rationale: The activation phase involves clonal expansion of lymphocytes with receptors matching the antigen.

Correct Answer: A

Rationale: BCRs on B cells can produce soluble antibodies, unlike TCRs or MHC molecules.

Correct Answer: D

Rationale: B and T cells express unique receptors via somatic rearrangement, unlike MHC molecules which are uniform per individual cell.

Correct Answer: D

Rationale: IgG is the predominant immunoglobulin in the gamma globulin fraction, making up most serum antibodies.