BIOL10003 : Genes & Environments Notes
30 Jul 2015
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When classifying organisms it is standard practice to a hierarchal system which includes: domain, kingdom, phylum, class, order, family, genus and species. (katie. Molecular similarities (dna, rna, proteins and other secondary metabolites). Analogous: between organisms that may not be closely related. Obligate parasites they require a host to reproduce. Acellular; consisting of a capsid made from capsomeres, a genome of single or double stranded rna or dna, and sometimes enzymes or a lipid membrane. New strains of viruses become apparent quickly due to the highly mutable nature of the viral genome. The viruses searches for a particular receptor on the host cell. The capsid and host receptor bind causing invagination. The virion enters the cell and releases its genome. The genome enters the nucleus of the host where it will make copies of itself. It may be necessary for the virus to undergo reverse transcription. The virus than uses the host ribosomes to synthesize its own proteins and enzymes.
