Which of the following best highlights the importance of proteins in immunity?
Correct answer: C. They act as antibodies
- A. They act as receptors of pathogens
- B. They are long term energy reserves
- C. They act as antibodies
- D. They act as mechanical barrier for pathogens
Explanation
Antibodies are immunoglobulins, that is proteins, and they are the specific weapon of the humoral response, binding one antigen each. Proteins do also serve as receptors, which makes the first option partly true, but antibodies are the direct and defining immune role the question asks for. Long term energy storage is the job of fat, not protein.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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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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