NEET BIOLOGY

Detailed explanation-1: -A virus attaches to a specific receptor site on the host cell membrane through attachment proteins in the capsid or via glycoproteins embedded in the viral envelope. The specificity of this interaction determines the host-and the cells within the host-that can be infected by a particular virus.

Detailed explanation-2: -Host specificity can be measured at both the interspecific level (extent of specialization inonespeciesover another) and the intraspecific level (extent of specialization to hosts within a species), although the latter differs depending on whether the host is a plant or an animal.

Detailed explanation-3: -Viruses of lower vertebrates include a large number of viral agents, belonging to different viral families and genera, with RNA and DNA genomes, and displaying different host specificities. In fact, some viruses have a very narrow host range, whereas others are known to be able to infect a wide range of species.

Detailed explanation-4: –Viral specificity refers to the specific. kinds of cells a virus can infect.