BIOC 4403 Lecture Notes - Lecture 8: Poliovirus, Mimivirus, Microorganism
4 Mar 2016
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Document Summary
Viruses: classification of viruses, classification of viruses based on nature of genomes, "typical" features of. Viral genomes: why viral genomes evolve fast, natural history of viral genes . Study online at quizlet. com/_1ymlq3 entities whose genomes are elements of nucleic acid that replicate inside living cells using the cellular synthetic machinery, and cause the synthesis of specialized elements [virions] that can transfer the genome to other cells. Presence / absence of envelope (typically membrane / protein derived from host) The type of cellular organisms they parasitize (e. g. , bacteriophages infect bacteria) Genomes can be linear, circular, or alternate between the two (retroviruses reverse transcribe rna genome and incorporate dna into host genome; becomes "provirus"). Gene expression patterns are similarly diverse, relating to how the genomes are organized. Gene dense is high (usually >1 gene per kbp, often with overlapping genes). Fast-evolving, divergent gene sequences, rna viruses in particular. Viral genomes are extremely diverse in their coding capacity (total gene number and diversity)
