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Which one of the following statements about viruses is correct?

1. Viruses possess their own metabolic system
2. Viruses contain either DNA or RNA
3. Viruses are facultative parasites
4. Viruses are readily killed by antibiotics

Correct answer: Viruses contain either DNA or RNA

Solution

Viruses have a nucleic acid genome, but it is typically one type only: either DNA or RNA, not both. They do not have their own metabolic system, are obligate intracellular parasites, and antibiotics do not kill them.

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