The part of an antibody molecule that binds the antigen is located in the
Correct answer: D. variable region at the tips of the two arms
- A. constant region of the heavy chains
- B. Fc tail
- C. carbohydrate side chains
- D. variable region at the tips of the two arms
Explanation
The amino acid sequence of the variable region changes from one antibody to another, shaping the binding site, while the constant tail determines class functions such as binding phagocytes. Structure and specificity meet at the tips.
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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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