lecture 2 - Structure and Function of Prokaryotic Cells •...

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Unformatted text preview: Structure and Function of Prokaryotic Cells • Outline – Differences between Prokaryotes and Eukaryotes – Nucleoid – Cell membranes – Cell walls – Locomotion – Inclusion bodies Structural differences between Prokaryotes and Eukaryotes • Prokaryotes have no defined organelles – DNA is not bounded by a membrane • Prokaryotes are generally much smaller in size – Equivalent to a mitochondrion in eukaryotes Large surface / volume ratio means more rapid transport rates faster growth rate • Excretion of waste products • Import of nutrients Bacteria Cell Shapes • Cocci = spheres – in bunches in chains • Bacilli = sticks, rods – alone in chains • Vibrios = bent rods • S p i r a l • Irregular Morphogenesis: change in shape • Monomorphic : one shape; observed in most pure cultures of bacteria • Pleomorphic: multiple shapes- Changes during growth ¾ Cells become smaller as they age- Response to environmental cues ¾ Sporulation (nutrient limitation) Cell Structure • Prokaryotes • Eukaryotes Bacterial Cell Envelope...
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This note was uploaded on 01/31/2011 for the course BIO 121 taught by Professor Ma during the Winter '10 term at UC Riverside.

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lecture 2 - Structure and Function of Prokaryotic Cells •...

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