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Assertion (A): Infectious free RNA that caused potato spindle tuber disease was named as viroid Reason (R): It was named so because the RNA of the viroid was of low molecular weight.

( a ) A is correct but R is incorrect
( b ) A is incorrect but R is correct
( c ) Both A and R are correct & R is not the correct explanation for A
( d ) Both A and R are correct but R is the correct explanation for A
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1 Answer

(C) is the right answer.

In 1971, T.O. Diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. It was found to be a free RNA; it lacked the protein coat that is found in viruses, hence the name viroid. The RNA of the viroid was of low molecular weight.
answered Jan 3, 2014 by pady_1
 

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