BIO 3124 Study Guide - Final Guide: Active Transport, Sarcoma, T Cell
6 Feb 2015
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Extracellular state: called virion, protein coat around nucleic acid, also called nucleocapsid, some have phospholipid envelope, outer layer provide protection and recognition sites for host cells. Intracellular state: capsid removed, virus exists as nucleic acid. Sizes vary from 10nm 400nm in diameter: genome sizes vary e. coli has 4000 genes vs. poliovirus has 4 genes. Show more variety in nature of their genomes than do cells. Primary way scientists categorize and classify viruses: may be dna or rna, but never both, can be dsdna, ssdna, dsrna, ssrna, may be linear and segmented or single and circular, much smaller than genomes of cells. 8 segments of rna genome of influenza virus strains. Hosts of viruses: only viruses containing all 8 segments are viable, new viruses can be created by re-assorting diff, combos of genes if cell is infected by 2 different. Infect only particular host"s cells: may be so specific they only infect particular kind of cells in particular hosts ex.
