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Chapter 18 - Viruses & Bacteria

Chapter 18 - Viruses & Bacteria - Viruses Bacteria Need...

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Viruses & Bacteria Need ESM to see viruses (diff. degrees of complexity) Outer structure called capsids (nucleic acids in a protein coat: RNA & DNA strands can be linear or circular; contain 400-700 genes) Capsids are compared of capsomeres *viruses are obligate intracellular parasites – cannot live by themselves; reproduce only within host cell Viruses can be alive, go inert when host cell dies, and come alive again when reintroduced to new host cell. Lock & Key mechanism capsomeres receptor molecules host proteins surface virus West Nile Virus – affects/carried by mosquitos; birds, horses, human Measles – only humans Viral Reproductive cycle Virus enters cell thru enzyme secretion Capsomere breaks down into DNA & Proteins DNA/RNA replicated; mRNA causes duplication capsid proteins Recombination in multiple copies of virus Lytic cycle – kills cells. Lysogenic – virus co-exists in host cell DNA & goes w/new daughter cells Temperate Phages – both lytic & Lysogenic Envelope RNA U cycle
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