Chapter 10b - Chapter 10b: Viruses I. Viruses A. General...

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Chapter 10b: Viruses I. Viruses A. General characteristics 1. Do not exhibit the characteristics of living organisms = do not belong to any of the recognized kingdoms 2. Viruses rely on living cells to replicate B. Structure of a virus 1. Protein coat = capsid 2. Nucleic acid core - DNA or RNA 3. Tail with tail fibers a. Found only in certain types of viruses known as Bacteriophages b. The tail is used as a means of attachment C. Replication of a typical virus (= lytic pathway ) 1. Attachment or adsorption to specific receptor sites on a host cell 2. Penetration a. The viruses inject the nucleic acid core into the host b. The capsid remains on the outside 3. Biosynthesis of new viral parts a. The living cell makes new strands of DNA or RNA using the host DNA as the blueprint b. New capsids are made 4. Maturation 5. Release a. The host cell is lysed or blows up or b. The viral particles bud out of the cell 6. Virus infected cells produce interferon that attempts to protect uninfected cells D. Types of viral infections 1. Acute infections a. Incubation period - short
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Chapter 10b - Chapter 10b: Viruses I. Viruses A. General...

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