nester03b(1)

nester03b(1) - Chapter 3: Microscopy and Cell Structure...

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Chapter 3: Microscopy and Cell Structure
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Important Point:
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Typical Bacterial Shapes Also Pleomorphic Bacteria, which vary in their shape (e.g., Corynebacterium ) .
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Typical Bacterial Arrangements streptococci sarcina staphylococci
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Prokaryotic Cell Structures
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Typical Prokaryotic Cell
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Cytoplasmic Membrane Movement across membrane for many substances is controlled by membrane proteins. Escherichia coli has >200 membrane proteins. Many of these proteins are involved in transport across membranes. Others of these proteins allow a bacterium to sense its surrounding environments (e.g., as in chemotaxis). Movement is via: Simple Diffusion (including osmosis) Facilitated Diffusion (with concentration Active Transport (against concentration gradient & energy expended)
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Simple Diffusion -- Osmosis solute molecules/ions
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Cytoplasmic Membrane
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nester03b(1) - Chapter 3: Microscopy and Cell Structure...

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