The protein that helps other cells resist viral infection is
Correct answer: C. Interferon
- A. Penicillin
- B. Histamine
- C. Interferon
- D. Antigens
Explanation
Interferons are a group of signaling proteins made and released by host cells in response to the presence of viruses. They allow communication between cells to trigger the protective defenses of the immune system that eradicate pathogens or tumors. The other options are not correct: Penicillin is an antibiotic for bacterial infections, Histamine is involved in allergic responses, and Antigens are molecules that trigger immune responses, not proteins that directly resist viral infections.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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