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Cell - Cell Structure and Function Cell Theory A unifying...

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Cell Structure and Function Cell Structure and Function
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Cell Theory A unifying concept in biology States that: All organisms are composed of cells Life processes of metabolism and heredity occur within these cells. All cells come only from preexisting cells
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Sizes of Living Things
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Cell Size Most much smaller than one millimeter (mm) Some as small as one micrometer ( μ m) Size restricted by Surface/Volume (S/V) ratio Surface is membrane, across which cell acquires nutrients and expels wastes Volume is living cytoplasm, which demands nutrients and produces wastes
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Prokaryotic Cells Lack a membrane-bound nucleus Structurally simple and small Two domains: Bacteria - Many pathogenic; photosynthetic, cycling of C, decompose organics Archaea - More diverse, extreme habitats, closer to Eukaryotes
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Prokaryotic Cells Appendages Cytoplasm Cell Envelope Bacteria - peptidoglycan Archaea - polysaccharides + proteins Gram + Gram - Circular DNA Plasmid
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Eukaryotic Cells Domain Eukarya Protists Fungi Plants Animals Cells contain: Membrane-bound nucleus Specialized organelles Plasma membrane
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Eukaryotic Cells : Organelles Allows eukaryotic cells to be larger than prokaryotic cells Isolates reactions from others Two classes: Endomembrane system: - Organelles that communicate with one another - Via membrane channels - Via small vesicles Energy related organelles - Mitochondria & chloroplasts - Basically independent & self-sufficient Compartmentalization
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Plasma Membrane
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