NEET BIOLOGY

Detailed explanation-1: -(A) Virus capsids are composed of viral protein subunits that form structural units. The triangulation number (T) indicates the number of structural units per face of the icosahedron. In a T = 1 virus, one structural unit (composed of three different protein subunits: gray, red, and blue) create the icosahedron face.

Detailed explanation-2: -Capsids are protein shells that surround and protect the viral genome. Capsid proteins often self-assemble into icosahedral structures with a quasi-equivalent arrangement of individual subunits.

Detailed explanation-3: -The three basic capsid shapes are icosahedral, helical, and prolate; however, the shape of capsids can vary widely. The capsids are made from capsomeres, or protein subunits.

Detailed explanation-4: -Capsomeres are tiny subunits that make up the protein coat, referred to as the capsid. Capsomeres are known as capsid subunits, which are the outer protective covering of proteins that protect the virus’s genetic material.

Detailed explanation-5: -The capsid surrounds the virus and consists of a small number of subunits of protein known as capsomeres, typically associated with, or located around, virion nucleic acid.