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Tardigrade
Question
Biology
Viroids have:
Q. Viroids have:
1283
241
Punjab PMET
Punjab PMET 2006
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A
single stranded RNA not enclosed by protein coat
B
single stranded DNA not enclosed by protein coat
C
double stranded DNA enclosed by protein coat
D
double stranded RNA enclosed by protein coat
Solution:
Viroids are small, single stranded, circular RNA molecules not enclosed by protein coat. They are discovered by T.O. Diener in 1971. Viroid replication requires host encoded RNA polymerase.