Genome of which of the following consists of a single molecule of DNA?
Correct answer: B. HBV
- A. HAV
- B. HBV
- C. HCV
- D. HIV
Explanation
The correct answer is HBV. HBV, also known as Hepatitis B Virus, has a single circular double-stranded DNA genome. This genetic makeup sets it apart from the other options, which either have single-stranded RNA genomes (HAV, HCV, HIV) or undergo reverse transcription from RNA to DNA (HIV). Understanding the genetic material of each virus is crucial in identifying the correct answer.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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