Question

The genome of Hepatitis B, a DNA virus, is unlikely to code for

• A. DNA dependent DNA polymerase
• B. RNA dependent DNA polymerase
• C. DNA dependent RNA polymerase
• D. Envelope protein

Hint:

• Viruses use host machinery when possible
• HBV → Reverse transcriptase present
• RNA polymerase → Usually host-derived

Answer 1

The Correct Option is C

Concept: Hepatitis B virus (HBV) is a DNA virus that replicates via a unique mechanism involving reverse transcription.
• It uses RNA-dependent DNA polymerase (reverse transcriptase).
• Host cell machinery provides some enzymes.

Step 1: Analyzing enzyme requirements.

• DNA dependent DNA polymerase: May be required for DNA replication → Possible.
• RNA dependent DNA polymerase: Present in HBV for reverse transcription → Correct for virus.
• DNA dependent RNA polymerase: Typically provided by host cell, not coded by virus → Unlikely.
• Envelope protein: Essential structural protein → Definitely coded.

Step 2: Selecting the correct answer.
HBV relies on host RNA polymerase, so it is unlikely to code for DNA dependent RNA polymerase.