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Infective constituent in viruses is either DNA or RNA, not protein. The simplest form consists of two basic components: a nucleic acid and a protein coat. The protein coat functions as a shell to protect the viral genome from nucleases and which during infection attaches the virion to specific receptors exposed on the prospective host cell.

1. Viruses are made of DNA and protein.
2. Viruses are made of RNA and protein.
3. Viruses are made of nucleic acid and protein.
4. Viruses are made of protein only.

Correct answer: Viruses are made of nucleic acid and protein.

Solution

Viruses consist of a nucleic acid (either DNA or RNA) and a protein coat. The protein coat protects the viral genome and facilitates attachment to host cells.

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