The majority of the 18 phyla of bacteria play a

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The majority of the > 18 phyla of Bacteria play a positive role (to humans) in nature Soil chemistry Antitoxins Genetic engineering So many more…
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Which group of bacteria is the largest in terms of diversity and numbers? A. Proteobacteria B. Firmicutes C. Actinobacteria D. Cyanobacteria E. Chlaymidiae
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The Archea Newest of all domains Least understood Contain Extremophiles methanogens (live in anoxic environments) extreme halophiles (salt- lovers) thermoacidophiles (grow at high temperatures with low pH) Crenarchaeota grow in hot, acidic environments such as hot springs and volcanic vents
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So much diversity!!! Each phylogenetic group has unique traits compared to other groups
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The Prokaryote Cell Understanding cellular differences between the prokaryotes can help determine species
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Cell Shapes Rod Bacillus species Coccus Spherical Cocci (appears in groups or chains) Spiral-Shaped (sprilliform) Vibrios Sprilillum Spirochete
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Cillia, Pilli and Flagella Microtubules control the beating of cilia and flagella locomotor appendages of some cells Cilia and flagella differ in their beating patterns
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Direction of swimming (b) Motion of cilia Direction of organism’s movement Power stroke Recovery stroke (a) Motion of flagella 5 m 15 m
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Flagella Mechanics Helical filament that when rotated, propels the organism The crank = the hook ATP powers
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Bacterial Movement Bacteria only move if there is a reason to move Chemicals are the reason Chemotaxis Chemo=chemicals Taxis = moving
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Bacterial Movement Can move without flagella or cillia Torque the cell body to produce movement E.g. Just like a snake moves The Spirochete Endoflagella
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Bacterial Movement Bacteria can glide across a surface Internal movement inside the cell Properties of water Surface tension Cohesion
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Pilli Method for transferring genetic material or other items to other cells… Bacterial Sex
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You are identifying bacterial shapes for your lab and see this arrangement on the slide. What is the proper description? A. Single Coccus B. Diplococcus C. Tetrad Coccus D. Streptococcus E. Staphylococcus
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Flagella and cillia produce the same kind of movement. A. True B. False
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The Prokaryote Cell Understanding cellular differences between the prokaryotes can help determine species
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