Question
Biology Question on biological classification
Which of the following shows coiled RNA strand and capsomeres?
A
Polio virus
B
Tobacco mosaic virus
C
Measles virus
D
Retrovirus
Answer
Tobacco mosaic virus
Explanation
Solution
Tobacco mosaic virus is a RNA virus that causes tobacco mosaic disease. It has single stranded coiled RNA molecule as its genetic material a part of which hangs outside the protein coat. Protein coat consists of approximately 2130 capsomeres which are helically arranged to form a hollow cylinder of about 4 nm diameter.