A) Variable regions of a light and another heavy chain
B) Variable regions of two. light chains
C) Variable regions of two heavy chains .
D) Variable -region -of a heavy chain and constant region of a light chain
Correct Answer: A
Solution :
Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Antigen-binding site (paratope) in an antibody includes variable regions of both heavy and light chains.
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