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A special defence system works specially against viral infection. It has no effect on micro-organism. Cells invaded by a virus produce an antiviral protein called interferon (IFN). The latter is released from the infected cell and on reaching the nearby non-infected cells it makes them resistant to the virus infection.

1. A special defence system works specially against viral infection.
2. It has no effect on micro-organism.
3. Cells invaded by a virus produce an antiviral protein called interferon (IFN).
4. None of the above.

Correct answer: Cells invaded by a virus produce an antiviral protein called interferon (IFN).

Solution

The correct choice is the statement that says virus-invaded cells produce interferon, an antiviral protein. This matches the described defense mechanism exactly, while the other options are either too general or not the key fact being asked.

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