Question

In the following diagram, what are the parts A ,B,C and D representing?

a	(A) COOH-end (C) Hinge	(B) heavy chain (D)Light chain
b	(A) Heavy chain (C)Hinge	(B)Light chain (D)COOH-end
c	(A)Hinge (C)Light chain	(B) COOH-end (D)Light chain
d	(A)Light chain (C)Hinge	(B)Heavy chain (D)COOH-end

Answer 1

The diagram represents an antibody. It is made up of four chains as two heavy chains and two light chains ($H_2{L}_2$). The $-N{H}_2$ end is present at the top (has the antigen binding region) and the $-COOH$ end at the base.

A represents light chain

B represents heavy chain

C represents hinge region

D represents $-COOH$ end

Hence, the correct answer is 'option D'