NEET BIOLOGY

Detailed explanation-1: -Indeed, viruses have the remarkable ability to spread from one host to another host, hosts that belong to the three cellular domains of life-Archaea, Bacteria, and Eukarya. This constitutes their host range.

Detailed explanation-2: -Whereas some viruses have very restricted host ranges and might only infect a single host species, other viruses have broad host ranges and infect multiple different host species. Extremely different host ranges can sometimes even be found among closely related viruses.

Detailed explanation-3: -Viruses are host-specific because they only can attach to and infect cells of certain organisms. Cells that a virus may use to replicate are called permissive. The virus attacks the host cell by first attaching to a specific receptor site on the membrane of the host cell.

Detailed explanation-4: -Viruses have been discovered that are able to infect every different cell type, although not all viruses can infect all cell types. For example, bacteriophages are viruses that specifically infect bacterial cells. Other types of viruses infect eukaryotic cells such as human cells.