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Consider the following statements: 1. Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes. 2. Common cold is sometimes caused by an adenovirus whereas AIDS is caused by a retrovirus. Which of the statements given above is/are correct?

UPSC · 2021 · Environment & Science & Tech
Question:
Consider the following statements: 1. Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes. 2. Common cold is sometimes caused by an adenovirus whereas AIDS is caused by a retrovirus. Which of the statements given above is/are correct?

Options

1 only
2 only
Both 1 and 2
Neither 1 nor 2
Answer: 2 only

Explanation:
Adenoviruses have double-stranded DNA, not single-stranded. They can cause common cold. Retroviruses, like HIV, contain single-stranded RNA that converts into DNA within host cells.

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