The variable region of the heavy chain differs in antibodies produced by different B cells, but is the same for all antibodies produced by a single B cell.
A
True
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B
False
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Solution
The correct option is A True The variable region of the heavy chain differs in antibodies produced by different B cells, but is the same for all antibodies produced by a single B cell. The constant region is identical in all antibodies of the same isotype. However, it differs in antibodies of different isotypes.