Question

Potato spindle tuber disease is caused by an organism which has:

• A. RNA with protein coat
• B. Low molecular weight free RNA
• C. Abnormally folded protein
• D. Crystalline structure

Answer 1

The correct option is B Low molecular weight free RNA

Potato spindle tuber disease is caused by an infectious agent called viroid. Viroids comprise free RNA of low molecular weight. They lack a protein coat that is found in viruses . Viruses are crystalline structures as they have a nucleic acid enclosed with a protein coat. Abnormally folded proteins are prions.