41. Immune System
Adaptive Immunity
Multiple Choice
Multiple ChoiceThe antigen-binding sites of an antibody molecule are formed from the molecule's variable regions. Why are these regions described as variable?
A
They can change their shapes to fit different antigens.
B
They change their shapes when they bind to an antigen.
C
Their specific shapes are unimportant.
D
Their sizes vary considerably from one antibody to another.
E
The amino acid sequences of these regions vary widely among antibodies from different B cells.
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