An antibody binds only to the antigen that stimulated its production because
Correct answer: D. the shape of its binding site matches a specific epitope of that antigen
- A. all antibody molecules are identical
- B. antigens destroy competing antibodies
- C. the blood filters out mismatched antibodies
- D. the shape of its binding site matches a specific epitope of that antigen
Explanation
Antibody arms carry binding sites shaped for one epitope, like a lock for one key, which is why each clone makes only one specificity. Uniform antibodies would make targeted immunity impossible.
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About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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