113lecture0506

113lecture0506 - BIOLOGY 113 - MICROBIOLOGY Lecture 5:...

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BIOLOGY 113 - MICROBIOLOGY Lecture 5: Prokaryotic Cell Biology - Structures internal to the cell wall, comparison with eucaryotes The plasma (cytoplasmic) membrane or prokaryotic cells is composed primarily of phospholipids and proteins (Tortora et al. Fig 4.13) - 50% or more of the mass of the bacterial plasma membrane may be protein = This is greater than the amount of protein in eucaryotic plasma membranes, perhaps because many of the functions of organelles in eucaryotes are assumed by the plasma membrane of prokaryotes = Also in contrast to eucaryotic plasma membranes, prokaryotic plasma membranes usually lack sterols - The plasma membrane is a fluid mosaic structure, in which phospholipids and proteins are able to move freely in two dimensions - The proteins in the membrane can be arranged in a variety of ways, depending on their functions (Tortora et al., Figure 4.13b) = peripheral proteins are loosely held on the inner surface of the membrane = integral proteins are embedded in the phospholipid bilayer, and may penetrate it completely
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113lecture0506 - BIOLOGY 113 - MICROBIOLOGY Lecture 5:...

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