question_answer

Which of the following shows coiled RNA strand and capsomeres?                 [NEET 2014]

A) Polio virus                     

B) Tobacco mosaic virus

C) Measles virus      

D) Retrovirus

Correct Answer: B

Solution :

[b] In TMV RNA is single stranded (ss) helically coiled structure containing about 2130 capsomeres, a basic subunit of capsid (an outer covering of protein that protects the genetic material of a virus).

There are about 16 capsomeres present in each helical turn.