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T.O. Diener discovered as...

T.O. Diener discovered as

A

free infectious RNA

B

free infectious DNA

C

infectious protein

D

bacteriophage

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Viroids are small, circular, single stranded free infectious RNA molecules that are the smallest known pathogens. The extracellular form of the viroid is naked RNA, i.e. there is no protein capsid of any kind. These RNA molecule contains no protein encoding genes and therefore, the viroid is totally dependent on host for its replication. No viroid diseases of animals are known and the precise mechanisms by which viroids cause plant diseases remain unclear.
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