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UPSC PYQPrelims 2021

Civil Services Examination · Question 70

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?

  1. 1 only
  2. 2 only
  3. Both 1 and 2
  4. Neither 1 nor 2
Show answer & explanation

Answer: (B) 2 only

Explanation

Adenoviruses have double-stranded DNA and retroviruses have single-stranded RNA. Adenoviruses can cause colds, and HIV is a retrovirus.