An antibody is made of _________ polypeptide chains?
Correct answer: D. 4
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
A typical antibody has four polypeptide chains: two identical heavy chains and two identical light chains joined by disulfide bonds. The two-arm Y shape can mislead students into choosing b, but the arms are formed from parts of all four chains.
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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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