Question

multiple choice question
heavy chains of an antibody are about how many amino acids long?

400

200

20

4000

Explanation:

Antibody heavy chains typically consist of about 450 - 550 amino acids, and among the given options, 400 is the closest approximation. The other options (200, 20, 4000) are inconsistent with the known length of antibody heavy chains.

Answer:

A. 400