For defense against a virus attack, the body produces:
Correct answer: D. Interferons
- A. Antibodies
- B. Histamines
- C. Antigens
- D. Interferons
Explanation
The correct answer is Interferons. Interferons are proteins produced by host cells in response to viral infections. They play a crucial role in the immune response by inhibiting viral replication within host cells and activating immune cells. While antibodies are essential for neutralizing viruses outside cells, they are not the primary defense against viruses that have already entered cells. Histamines are related to allergic responses, and antigens are not produced by the body but are targets for the immune system.
This question appeared on the ETEA MDCAT 2018 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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