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
Correct Answer: A
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.
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