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Question

Which of the following shows coiled RNA strand and capsomers ?

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

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'.

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