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Solution


Q.

Which of the following shows coiled RNA strand and capsomeres                   [2014]
1 Polio virus  
2 Tobacco mosaic virus  
3 Measles virus  
4 Retrovirus  

Ans.

(2)

Tobacco mosaic virus is a RNA virus that causes tobacco mosaic disease. It has a single-stranded coiled RNA molecule as its genetic material, a part of which hangs outside the protein coat. The protein coat consists of approximately 2130 capsomeres, which are helically arranged to form a hollow cylinder of about 4 nm diameter.