Capsid of viral structure is-: (A) Extracellular infectious particle, (B) Protein coat around nucleic acid, (C) Envelop around a virus, (D) None of the above
Answer is B. Ans. is 'b' i.e., Protein coat around nucleic acid Structure of viruso The extracellular infectious virus particle is called as the virion.o The virion consist of a nucleic acid surrounded by a protein coat, the capsid.o The capsid with the enclosed nucleic acid is known as the nucleocapsid.o Two kinds of symmetry are encountered in the capsid -a) Icosahedral (cubical)b) Helicalo Virion may be enveloped or nonenveloped (naked).o Envelope is lipoprotein in nature, lipid is derived from host cell, while protein is virus coded.