Question

Which of the following does not occur during the lag period of the primary antibody response?

a) Clonal expansion
b) Antigen recognition
c) Antibody production
d) Secondary response activation

Answer 1

During the lag period of the primary antibody response, antigen recognition and clonal expansion occur, while secondary response activation does not.

Step-by-step explanation:

The lag period of the primary antibody response is the initial stage after the first exposure to an antigen.

During this lag period, antigen recognition occurs, where B cells bind to the antigen with their B cell receptors (BCRs).

This is followed by clonal expansion, where the B cell clones proliferate and differentiate into plasma cells, which produce antibodies.

Therefore, the correct answer is d) Secondary response activation, as the activation of the secondary response occurs during a subsequent exposure to the same antigen, not during the lag period of the primary response.