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The infectious agent in viruses is either DNA or RNA, but not protein. The simplest viruses are composed of two main parts: a nucleic acid core and a protein shell. The protein shell safeguards the viral genetic material from degrading enzymes and helps the virus attach to specific receptors on the host cell during infection.

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

Correct answer: Viruses consist of nucleic acid and protein.

Solution

Viruses are composed of a nucleic acid (either DNA or RNA) and a protein coat called the capsid. The protein coat protects the genetic material and facilitates attachment to host cells during infection.

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