VIRUSES
Viruses are tiny particles which can cause infection diseases. A complete virus is composed of the genetic material called genome covered by a coat called capsid. In some cases an additional coat called envelope is also present around the capsid. Capsid is the protective coat made of proteins. Envelope where present is often covered with spikes that help to identify the host cell. A virus after invading a host cell use components of the host cell replicates rapidly for producing more and more viruses of its own kind. On completion of replication cycle the new viruses damage the host cell and are released to invade the other cells of the host body. In this way the host cell are damaged and destroyed are rapidly. The diseases caused by viruses in human are AIDS, COVID-19, HEPATIIS, POLIO COMMON COLD, MEASLES, etc
Viruses causing different diseases;-
BACTERIA
Bacteria are single called microorganisms found in every type of environment. A bacteria cell is simply nucleoid or DNA without any nuclear membrane present in the cytoplasm surrounded by a plasma membrane and an outer protective cell wall. Some bacteria have protective capsule over the cell wall. Ribosome are the sites for protein synthesis.
BACTERIA CELL;-
0.898 SRY