Question

Difference between Virus and Viroid is

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

Answer 1

The correct option is D absence of protein coat in viroid but present in virus

Virus :

• Virus is a non cellular and ultramicroscopic infectious agent that multiplies only inside the host. Outside the host they are inert particles.
• These are nucleoproteins having one or more nucleic acid molecules,either DNA or RNA, enclosed in a protein coat.

Viroids :

• Viroids are infectious agents containing naked RNA without any protein coat.
• It has small single-stranded circular $RNAs$ that are only $250-400$ bases long.

Final answer :

$a.$ Absence of protein coat in viroid but present in virus.