An epitope is generally used to refer to an area on a much larger molecule (e.g., a viral protein) with which an antibody can react.

Correct Answer: A

Rationale: An epitope is the specific region on an antigen recognized by antibodies or T cell receptors.

Correct Answer: D

Rationale: IgM is a pentamer, with five monomer units linked by disulfide bonds and a J chain.

Correct Answer: B

Rationale: Fluorescent antibodies emit light under UV excitation, making them suitable for examining specimens with UV light.

Correct Answer: D

Rationale: The two types of immunoglobulin light chains are lambda (λ) and kappa (κ).

Correct Answer: C

Rationale: Theαβ TCR resembles a membrane-bound Fab fragment with short cytoplasmic tails.