Which is NOT part of a description of an antibody molecule?
A. contains a constant and a variable region on each chain
B. forms an X-shaped protein molecule
C. contains an antigen-binding site on each arm
D. contains two light chains and two heavy chains
Answer: B
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a. on land b. after the amphibians c. in water d. after the first amniotes e. from the ray-finned fishes
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