1.

When a B-cell undergoes immunoglobulin class switching

A. the variable region of the light chain changes, but its constant region remains the same
B. the variable region of the light chain remains the same, but its constant region changes
C. the variable region of the heavy chain remains the same but its constant region changes
D. the variable region of the heavy chain changes but its constant region remains the same
Answer» D. the variable region of the heavy chain changes but its constant region remains the same


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