Question

Difference between virus and viroid is

• A. absence of protein coat in viroid but present in virus
• B. presence of low molecular weight $RNA$ in virus but absent in viroid
• C. both (a) and (b)
• D. none of the above

Answer 1

Answer: (A)

absence of protein coat in viroid but present in virus

Answer 2

Viroids are smallest known agent of infectious diseases. They lack capsid as well as proteins (that are present in virus) and consist of only single stranded $RNA$. The $RNA$ of the viroid is of low molecular weight.