Question

RNA Viruses are entirely dependent on the host for:

• A. replication machinery
• B. transcriptional machinery
• C. RNA capping machinery
• D. protein translation machinery

Hint:

No Virus has Ribosomes.

Answer 1

The Correct Option is D

Step 1: Concept
All viruses are obligate intracellular parasites that must utilize host cell resources to reproduce.

Step 2: Meaning
While many RNA viruses carry their own replication enzymes (like RNA-dependent RNA polymerase), no virus contains its own ribosomes.

Step 3: Analysis
RNA viruses can often replicate their own RNA or provide their own capping enzymes, but they lack the machinery to synthesize proteins. They are completely dependent on the host cell's ribosomes, tRNAs, and translation factors to produce viral proteins.

Step 4: Conclusion
The protein translation machinery is the universal host requirement for all viruses. Final Answer: (D)