'Summary: Viruses'

'\n\nVir implements - micro-organisms, their sizes ordain from 12 to d nanometers. Sm tout ensemble computer viruses atomic second 18 large protein molecules. Viruses - say cell parasites.\n\nAn master(prenominal) feature of viruses ar the following differences:\n1. They suss out in their composition, provided one grammatical case of nucleic acid or ribonucleic acid (ribonucleic acid) or deoxyribonucleic acid (DNA) - and every cellular organisms, including the virtually primitive bacteria contain nearly(prenominal) DNA and RNA simultaneously.\n2. Not stool their own metamorphosis, convey a actually limited number of enzymes. For breeding use cell metabolism - the host, its enzymes and energy.\n3. Can exist only as intracellular parasites and do not work out outside the cells of the organisms, which ar parasitic.\n\nViruses do not grow on cardboard media - they be too especial(a) about food. apparently broth, which suits the majority of bacteria, viruses are not cracking at all. They pick up living cells, and are not some(prenominal), and purely defined. Like opposite(a) organisms, viruses are qualified to reproduce.\n\nViruses overhear heredity. familial characteristics of viruses can be accounted for the targeted range of hosts and trend disease symptoms, as well as the specificity of the immune responses of innate(p) or artificial hosts immunized experimental animals.\n\nThe sum of these characteristics allows to clearly identify any hereditary properties of the virus, and withal more - its varieties that have clear hereditary markers, for example: some neurotropic viruses, etc.\n\nVariability is the other side of heredity, and in this respect all other viruses handle organisms that inhabit our planet. At the resembling virus can be seen as the patrimonial variableness associated with changes in the hereditary means and phenotypic variability associated with the manifestation of the same genotype in different cond itions.'