Consider the following statements :
- 1.Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes.
- 2.Common cold is sometime caused by an adenovirus whereas AIDS is caused by a retrovirus.
Which of the statements given above is/are correct?
Show answer
Answer: B. Statement 1 is wrong: adenoviruses have double-stranded DNA, while retroviruses have single-stranded RNA. Statement 2 is correct: adenoviruses can cause common colds, and AIDS is caused by HIV, a retrovirus. So only 2.
Watch for: Retroviruses have RNA genomes that are converted into DNA, not DNA genomes.
Why the other options are wrong
- A. Wrong because statement 1 swaps and misstates the genome types.
- C. Wrong because statement 1 is false.
- D. Wrong because statement 2 is correct.
Source to check: NCERT Class 12 Biology, Chapter 8 Human Health and Disease (AIDS)
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.