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Practice MCAT Question - Q126

Antibodies are “Y-shaped” molecules consisting of four polypeptide chains: two larger (heavy) chains and two smaller (light) chains. Each chain has a constant region and a variable region that contains a unique amino acid sequence. Which region of the antibody will most likely form the binding site with the foreign antigen?

A.  Constant regions
B.  Variable regions
C.  Both A and B
D.  Neither A nor B

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