Topic 5 Talaro6th-Chapter 6R

Topic 5 Talaro6th-Chapter 6R - Chapter 6 (Talaro) An...

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Chapter 6 (Talaro) – An Introduction to Viruses I. Common properties of viruses [Table 6.1] A. Obligate intracellular parasites 1. Found in all cellular species 2. Specific for one or only a few species 3. Noncellular, incapable of independent metabolism B. Very small, measured in nm [Fig. 6.1] II. General structural features of viruses A. Common components [Fig. 6.4] 1. Capsid = protein ‘shell’ 2. Genome = DNA or RNA (double-stranded or single-stranded) 3. Matrix proteins inside capsid 4. Some animal viruses have an envelope that covers the capsid; others are naked . B. Most capsids have a ‘simple’ geometric shape 1. Limited number of genes means few proteins for ‘building’ Helical nucleocapsid [Figs. 6.5, 6.6] Icosahedral nucleocapsid [Figs. 6.7, 6.8] 2. Size of capsid proportional to size of viral genome (i.e., what is packaged inside) C. Complex viruses [Fig. 6.9, 6.10a] D. Naming viruses 1. DNA-containing [dsDNA or ssDNA] 2. RNA-containing [dsRNA, ssRNA: (+)RNA or (-)RNA]
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This note was uploaded on 01/23/2010 for the course BIO 307D taught by Professor Moore during the Fall '09 term at University of Texas at Austin.

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Topic 5 Talaro6th-Chapter 6R - Chapter 6 (Talaro) An...

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