EBio - notes8 - DNA Technology 12-4

EBio - notes8 - DNA Technology 12-4 - Chapter 18 Viral and...

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Chapter 18 Viral and Bacterial Genetics VOCABULARY Capsid, Viral Envelope Lytic, Lysogenic, Viral Envelope, Prophage DNA virus, RNA virus Prions Horizontal gene transfer: transformation, transduction, conjugation FIGURES: 18.4, 18.6, 18.7, 18.8, 18.13 CONCEPTS Viruses are different and can have different types of genomes Viral life cycles: lytic & lysogenic Bacteria can obtain new genetic information in a variety of ways: conjugation, transformation, transduction Structure of Viruses Viruses are not cells Viruses are very small infectious particles consisting of: nucleic acid enclosed in a protein coat and, in some cases, a viral envelope Are obligate intracellular parasites Viral Genomes Viral genomes may consist of: Double- or single-stranded DNA Double- or single-stranded RNA Depending on its type of nucleic acid, a virus is called a DNA virus or an RNA virus
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Capsids and Envelopes Capsid: a protein shell that encloses the viral genome Some viruses also have viral envelopes that surround the capsid and help them infect Viral envelopes are mostly derived from the host cell’s membrane Reproductive Cycles of Phages Viruses have two reproductive mechanisms: the lytic cycle and the lysogenic cycle The Lytic Cycle The lytic cycle culminates in the death of the host cell The lytic cycle produces new phages and digests the host’s cell wall, releasing the progeny viruses
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This note was uploaded on 02/28/2008 for the course EBIO 1210 taught by Professor Demmig-adam during the Fall '07 term at Colorado.

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EBio - notes8 - DNA Technology 12-4 - Chapter 18 Viral and...

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