AP BIOLOGY

Detailed explanation-1: -It is essential to understand that only certain species of hosts or certain cells can serve as hosts for viruses or bacteria. Host cells that allow viruses or bacteria to invade them are called permissive cells.

Detailed explanation-2: -This subsection of the Names and taxonomy section only exists in viral entries and indicates the host(s) either as a specific organism or taxonomic group of organisms that are susceptible to be infected by a virus.

Detailed explanation-3: -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-4: -A virus is a tiny, infectious particle that can reproduce only by infecting a host cell. Viruses “commandeer” the host cell and use its resources to make more viruses, basically reprogramming it to become a virus factory. Because they can’t reproduce by themselves (without a host), viruses are not considered living.

Detailed explanation-5: -How viruses travel through the body. Once a virus gets into a host’s body, it travels along the surfaces of cells until its proteins begin to bind with receptors on the cells. The virus and the cells then fuse, allowing the DNA or RNA inside the virus to enter the cells, where it begins to reproduce.