NEETBotanyBiological Classification
What is the main difference between viroids and viruses?
Options
- AViroids lack a protein coat, while viruses have one
- BViroids have a protein coat, while viruses lack one
- CViroids have low molecular weight RNA, while viruses have high molecular weight RNA
- DViroids are obligate parasites, while viruses are saprophytic
Correct answer
A. Viroids lack a protein coat, while viruses have one
Step-by-step solution
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.