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Lecture 7 Bacteria & Viruses

Lecture 7 Bacteria & Viruses - Bacteria Viruses Lecture...

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Bacteria & Viruses Lecture 7
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Microorganisms as parasitic agents Parasite : an organism that lives in or on a host organism from which it secures some advantage Adverse effects on the host--> infectious disease
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Overview Prokaryotes - -> small, simple cells with no membranes surrounding their genetic material. smallest, simplest, and most abundant cells on earth include bacteria and archea, both of which lack a nucleus and organelles but are functionally complex Some cells may be encased in an envelope that protects, supports, and regulates transport
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Bacterial morphology/size Bacteria - ~0.2-2 μ m wide ~1-5 μ m long
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Bacterial morphology/size Bacteria may be: cylindrical ( bacilli, bacillus ) spherical ( cocci, coccus ) helical ( spirilla, spirochete ) polymorphic ( many shaped, amorphous ) Shape, size and arrangement of bacterial cells are extremely varied (bacilli, cocci, spirochete, amorphous in shape)
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Bacterial cell arrangements Diplococci (diplobacilli) Streptococci (streptobacilli) Staphylococci Tetrad ( staphyle = "bunch of grapes")
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