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Which one of the following statements about viruses is correct?

1. Nucleic acid of viruses is known as capsid
2. Viruses possess their own metabolic system
3. All viruses contain both RNA and DNA
4. Viruses are obligate parasites

Correct answer: Viruses are obligate parasites

Solution

Viruses cannot carry out metabolism or reproduce on their own; they must use a host cell’s machinery. That makes them obligate parasites.

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