IntroBio-17-Prokaryotes

IntroBio-17-Prokaryotes - Domain Bacteria 1 The...

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Domain Bacteria 1
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The Three-Domain System 2
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Ecological importance Lived and evolved all alone on Earth for 2 billion years Responsible for creating the properties of the atmosphere and the soil 3
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Most are benign; only a few cause disease Biochemical cycles Decomposers : breakdown of wastes and dead organisms 4
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Economic importance Industrial processes : vinegar; lactic acid fermentation used in production of cheese and yogurt In medicine - antibiotics 5
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Shape Spherical (coccus) Rod-shaped (bacillus) Spiral (spirillum) 6
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3 bacterial shapes 7
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Neisseria gonorrhoeae 8
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Streptococcus pyogenes 9
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E. coli 10
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Vibrio cholerae 11
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Structure Prokaryotic cells Unicellular Small No nucleus or other membrane- bound organelles 12
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Bacterial Cell Structure DNA pilus flagellum cytoplasm with ribosomes capsule cell wall plasma membrane 13
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1. Cytoplasm 80% - water; biological molecules Site of most bacterial metabolism 14
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2. Nucleoid Region of the cell that is currently occupied by the DNA Bacterial genome : single circular molecule of double stranded DNA 15
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3. Ribosomes Composition : ribosomal RNA and protein Function : site for protein synthesis 16
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17
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This note was uploaded on 11/01/2010 for the course BIO 110 taught by Professor Drazkiewicz during the Fall '09 term at San Mateo Colleges.

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IntroBio-17-Prokaryotes - Domain Bacteria 1 The...

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