Biological Classification Ques 139
139. Tobacco Mosaic Virus (TMV) genes are
[1994]
(a) double stranded RNA
(b) single stranded RNA
(c) polyribonucleotides
(d) proteinaceous
Show Answer
Answer : b
Hints & Solutions
(b) All viruses are nucleoprotein (Nucleic acid + Protein) in their structure. The nucleic acid (DNA and RNA) is genetic material. In a particular virus either DNA or RNA is genetic material. Both are never present in a virus. Hence viruses contains:
(i) Double stranded DNA (ds DNA) - Hepatitis B
(ii) Single stranded DNA (ss DNA) - coliphage
(iii) Double stranded RNA (ds RNA) - Reo virus, wound Tumor virus
(iv) Single stranded RNA (ss RNA) - Tobacco mosaic virus (TMV)
BETA
