Variable amino acid sequences in antibody molecules are found in:
Correct answer: D. Both heavy and light chains
- A. Both light chains only
- B. Both heavy chains only
- C. One heavy and one light chain
- D. Both heavy and light chains
Explanation
The amino acid sequence in the tips of the "Y" varies greatly among different antibodies. This variable region, composed of 110-130 amino acids, gives the antibody its specificity.
This question appeared on the UHS MDCAT 2016 paper, which you can sit online with every answer explained.
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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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