Write short notes on 'Viroids'
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Viroids are much smaller than viruses and are also simpler for they consist of not more than a single strand of RNA.
The RNA is not enclosed in any structure except during infection is not associated with any other chemical substances.
The typical viroid is an RNA molecule about 50 nm in length.
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VIROIDS
o Viroids were first discovered in 1971 by Theodor O. Diener.
o They are SMALLER than viruses.
o They are responsible for SPINDLE FIBER DISEASE in POTATOES.
o They lack PROTEIN COAT.
o Free RNA (RNA is of low molecular weight)
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