On the Heavy-Chain Immunoglobulin Gene Locus,recombination Signal Sequences Flank _______

Multiple Choice

On the heavy-chain immunoglobulin gene locus,recombination signal sequences flank _______ of the V segment,_______ of the D segment,and _______ of the J segment.

A) the 5′ side; both sides; the 3′ side
B) the 5′ side; the 5′ side,the 5′ side
C) the 3′ side; both sides; the 3′ side
D) both sides; both sides; both sides
E) the 3′ side; both sides; the 5′ side.