eemb 3 6

eemb 3 6 - October 5, 2011 Prokaryotes Diversity II...

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October 5, 2011 Prokaryotes Diversity II Announcements – there will be a review guide, and practice test up on gauchospace soon 1. Gram staining – staining bacteria to make bacteria more visible a) gram positive – retain original stain (violet/blue color) mass amounts of layers (up to 40 layers thick) most of the weight of the bacteria is peptidoglycan b) gram negative – did not retain stain, but held counter stain (pinkish color) still have peptidoglycan, but not as much of it c) today, we know that these two colors separate bacteria into groups with different thickness cell walls all bacteria have peptidoglycan in their cell walls bacteria have been competing with other bacteria and other archaeans for billions of years for resources 2. bacteria evolved chemical weapons – some of which we have used in medicine as antibiotics 3. when bacteria were busy evolving these chemical weapons, they were also evolving impressive defenses a) compounds that break down those chemical compounds they produce in case it is from a
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eemb 3 6 - October 5, 2011 Prokaryotes Diversity II...

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