Question

What is the difference between virus and viroids?

Answer 1

	Virus	Viroids
1.	Virus was discovered by D. J. Ivanowsky in 1892	Viroids was discovered by T.O. Diener in 1971
2.	They are larger in size than viroids	They are smaller in size
3.	They possess protein coat called capsid and nucleic acid as genetic material.	They lack protein coat and exist as free RNA
4.	They possess either DNA or RNA	They possess single stranded circular RNA