pre32 - Class 32 Reading: Topic: Biol 002 4/18/08 Chapter...

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Class 32 Biol 002 4/18/08 Reading: Chapter 25: 531-542 Topic: Viruses! I. Biology of viruses What are their characteristics as parasites? How do they depend on hosts? They need hosts to multiply. Viruses cannot multiply by themselves b/c they need to use the cellular machinery of the hosts. How do they differ from true cells? They are only made up of nucleic acid and a protein shell. Capsid: protein sheath around nucleic core Envelope : derived from both the host cell and proteins from viral genes; around the capsid; made up of proteins, lipids, and glycoprotein molecules Why might we call them Nature's efficiency experts at reproduction? That’s the only thing that they do. They go into cells and reproduce. Which types have the simplest process of reproduction? RNA viruses What are the basic events of viral infection? 1. Virus attaches to the cell wall 2. Viral DNA injected into the cell 3. Virus is replicated by the cell 4. Cell bursts and viruses are released to infect other cells How do they differ in: capability for latency: Lytic immediately change the cell
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This note was uploaded on 04/18/2008 for the course BIO 102 taught by Professor Haworth during the Spring '08 term at Marquette.

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pre32 - Class 32 Reading: Topic: Biol 002 4/18/08 Chapter...

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