Viruses - Biology 111 Principles of Biology Lecture...

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Biology 111, Principles of Biology Lecture Outlines Viruses Viruses are simple infectious particles May include only a protein coat (CAPSID) and a genome Genome (genetic material) may be DNA or RNA Animal viruses may also be surrounded by an envelope (membrane) Propagate only by infection of a host cell Viruses are NOT alive (review features of living organisms) Examples of Viruses (see Figure 18.4): Viruses that infect bacteria (bacteriophage), plant cells, and animal cells may Some animal cell viruses also include an envelope Outer membrane layer that surrounds the capsid Includes viral-encoded glycoproteins Bacteriophage attaches to bacterial host cell Injection of bacteriophage DNA stimulates degradation of host cell DNA Assembly of new bacteriophage
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Viruses - Biology 111 Principles of Biology Lecture...

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