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Transcript
3a - Prokaryotic Cells What is it to be alive? 1) growth What is it to be alive? 1) growth 2) capable of reproduction What is it to be alive? 1) growth 2) capable of reproduction 3) responsiveness/irritability What is it to be alive? 1) growth 2) capable of reproduction 3) responsiveness/irritability 4) perform metabolism What is it to be alive? 1) growth 2) capable of reproduction 3) responsiveness/irritability 4) perform metabolism 5) made of cells What is it to be alive? 1) growth 2) capable of reproduction 3) responsiveness/irritability 4) perform metabolism 5) made of cells 6) involved in evolution Prokaryotes vs. Eukaryotes size organelles (including nucleus) DNA ribosomes Sizes Very large bacteria Thiomargarita namibiensis Common prokaryotic cell shapes Fig. 11.1 Bacterial flagellum/a Flagellar Arrangements peritrichous monotrichous amphitrichous lophotrichous Bacterial movement by flagella or swim & twiddle axial filaments made of endoflagella sheath stalk prostheca peptidoglycan Wall Cytoplasmic/ plasma/cell membrane Why organisms make cells walls hopanoids Cytoplasmic/plasma/cell membrane Nitrosomonas: folded membrane for respiration Rhodospirillum: folded membrane for photosynthesis Passive aquaporin tonicity Active Transport Group Translocation cytoskeleton Other prokaryotic internal structures (inclusions) lipid “Bt” toxin carboxysomes sulfur magnetite aka. gas vacuoles Endospore: sporulation