Civil Services Prep

Prelims 2021 · Science and Technology · Question 70

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

  1. 1 only
  2. 2 only
  3. Both 1 and 2
  4. Neither 1 nor 2

Answer

2 only

Statement 1: Incorrect. Adenoviruses are double-stranded DNA (dsDNA) viruses, while retroviruses are single-stranded RNA (ssRNA) viruses that use reverse transcriptase; so the statement reverses the facts.

Statement 2: Correct. Common cold can be caused by adenoviruses (among other viruses), and AIDS is caused by HIV, which is a retrovirus.

Therefore, only statement 2 is correct.

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