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MDCAT Biology QUESTION #4293
Question 1
Which of the following best highlights the importance of proteins in immunity?
  • They act as receptors of pathogens
  • They are long term energy reserves
  • They act as antibodies
  • They act as mechanical barrier for pathogens✔️
Correct Answer Explanation
Proteins such as keratin in skin form mechanical barriers that physically prevent pathogens from entering the body, highlighting their protective structural role in immunity.