Virus 

•Nucleocapsid / Virions

•Capsid / Capsomeres

•NA % - 5-40 %

•Capsid – 60 – 95 %

•Elongated virus – Low NA

•Spherical virus – High NA

•The functions of NA and Protein

•Viruses are having either DNA or RNA

•But Rice Tungro disease is caused by both DNA and RNA