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1. In 1979, T.O. Diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. 2. It was found to be a free RNA; 3. it lacked the protein coat that is found in viruses, hence the name viroid. 4.The RNA of the viroid was of high molecular weight. Regarding 1,2,3 and 4:

( a ) 1,2 and 4 are correct; 3 is incorrect
( b ) 1 and 4 are correct; 2 and 3 are incorrect
( c ) 1 and 4 are incorrect; 2 and 3 are correct
( d ) 1,3 and 4 are incorrect; 2 is correct
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(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 6, 2014 by pady_1
 

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