What are compulsory parasites?

The obligation parasite is a parasite that must be with its host or die. Weak parasites depend on the presence of the host to complete their life cycle. Weak parasites are common. There are parasitic plants, fungi, bacteria and animals. The inverse of the envelope parasite is an optional parasite, a parasite that can complete its life cycle independent of the host. Viruses are pieces of genetic material covered with protein sheath, which are able to bear the machine for the synthesis of cell proteins and their use to draw copies of the virus. Given their inability to reproduce viruses independently, sometimes the Kingdom of Life has been excluded, although this definition of "life" may be inappropriate because there are a number of more complex compulsory parasites. Defense against viruses could be one of the first evolutionary imperatives of bacteria and eukaryotes, and both developed a number of genetic machines and response mechanisms to control errors for slowing viral attackers.

In addition to viruses, there are other mandatory intracellular parasites. These include bacteria such as Chlamydias and Rickettsia, among the smallest viruses with the least complex genomes. Chlamydia is responsible for sexually transmitted disease No. 1 in the world, chlamydia, which is also the most important cause of infectious blindness. Because compulsory intracellular parasites do not have any monitoring genetic system and cannot be grown in a conventional artificial environment and require tissue culture, it can be difficult to study. Historically, these bacteria were considered organisms somewhere between viruses and bacteria.

Even some protozoa (eukaryots, cells much more complicated than bacteria) are mandatory intracellular parasites, especially plasmodium , at least ten species, of which people infect. It is assumed that they come from dinoflagellates, photosynthetic protozoa that eventually lost their photosynthetic ability whenTheir parasitic lifestyle has increased their emphasis. Interestingly, it is assumed that the mitochondria, the power plants present in every human cell, may have launched their evolutionary journey as intracellular parasites, but subsequently became so integrated into the host that they actually became part of it.