51.
T-cell receptors or antibodies react with antigens
Answer: B
Correct answer: because of complementary of molecular fit of both with antigen
Both receptors work by shape complementarity: the binding site and the epitope fit together closely enough for many weak non-covalent interactions to act at once, and the sum of them gives the affinity. The specificity is a matter of fit, not of chemistry unique to either molecule, which is why two structurally unrelated receptor families can perform the same task.
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