Question

Which of the following shows coiled RNA strand and capsomers ?

• A. 8% Poliovirus
• B. 69% Tobacco mosaic virus
• C. 8% Measles virus
• D. 15% Retrovirus

Answer 1

The correct option is B 69% Tobacco mosaic virus

Tobacco mosaic virus is a positive sense coiled single-stranded RNA virus that infects tobacco and other members of the family Solanaceae.

Tobacco mosaic virus has a rod-like an appearance. Its capsid is made from 2130 capsomeres and one molecule of genomic single strand RNA which is 6400 bases long.

The coat protein self-assembles into the rod-like helical structure around the RNA which forms a hairpin loop structure. Inside the core helix, coiled RNA molecule is present. Coiled RNA is absent in measles, retrovirus and poliovirus.

So, the correct answer is 'Tobacco mosaic virus'.