Which of the following best highlights the importance of proteins in immunity?
- 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.