EVERYDAY SCIENCE

Detailed explanation-1: -Most viral infections eventually result in the death of the host cell. The causes of death include cell lysis, alterations to the cell’s surface membrane and various modes of programmed cell death. Some viruses cause no apparent changes to the infected cell.

Detailed explanation-2: -Effects on Cell Biochemistry: Many viruses inhibit the synthesis of host cell macromolecules, including DNA, RNA, and protein. Viruses may also change cellular transcriptional activity, and protein-protein interactions, promoting efficient production of progeny virus.

Detailed explanation-3: -When a virus enters the body of the host, the virus begins to replicate with the help of the host cell machinery. The replication occurs due to biochemical and structural changes that lead to cell damage or complete destruction of the cell. The cells that are infected die through apoptosis or lysis.

Detailed explanation-4: -A variety of DNA and RNA viruses are capable of affecting gene expression by directly altering the host cell genome. For example, the host cell DNA is degraded after infection with poxviruses.