Q. Consider the following statements:
1.Adenoviruses possess double-stranded DNA genomes, whereas Retroviruses possess double-stranded RNA genomes.
2.The common cold can be caused by an Adenovirus, while AIDS is caused by a Retrovirus.
3.Retroviruses use the enzyme reverse transcriptase to integrate their genetic material into the host’s DNA.
Which of the statements given above are correct?

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: B
Notes:

Explanation:

  • Statement 1 is incorrect: Adenoviruses possess double-stranded DNA genomes, whereas Retroviruses possess single-stranded RNA genomes. Unlike the original prompt’s incorrect premise, Adenoviruses are dsDNA viruses. Retroviruses (like HIV) are ssRNA viruses.
  • Statement 2 is correct: Adenoviruses are a common cause of respiratory infections (cold); HIV is a classic retrovirus.
  • Statement 3 is correct: This is the defining characteristic of retroviruses, allowing them to turn RNA into DNA within a host cell.
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