Micro Lecture 5

Micro Lecture 5 - Biology 31 Microbiology Lecture 5...

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Biology 31 Microbiology Lecture 5 Viruses, Viroids, and Prions 1. Viruses Non-cellular Not composed of a living cell Cell is the basic unit of life Non-living entities Can’t kill it Can destroy it or deactivate it All are obligate intracellular parasites consisting of: A strand of nucleic acid DNA or RNA Surrounded by a protein coat Some are enclosed by an envelope Replicates inside a host cell Pirates host’s metabolic mechanisms Tricks cell into producing more of the virus Host range Spectrum of host cells in which a virus can infect and multiply Most infect only specific cells of a single host species Some can cross-infect species Host range is determined by: Specific attachment sites on surface of host’s cells Availability of host cellular factors Ability of host cell to reproduce the virus Virus Size Highly variable Typically very small 20 – 1000 nm in length (or 1 um) Need an electron microscope to ascertain
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This note was uploaded on 05/11/2011 for the course BIO 31 taught by Professor Silva during the Spring '11 term at Reedley.

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Micro Lecture 5 - Biology 31 Microbiology Lecture 5...

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