1) Core. 2)Capsid. 3)Virion. 4) Nucleoprotein. AIPMT (prelims)-2010
Capsid.While virion is complete virus particle containing capsid and nucleic acid.Nucleoprotein is protein attached with nucleic acid.so the capsid of virus with enclosed nucleic acid is nucleocapsid and capsid is protein as well.so its nucleoprotein