Micro-04A-Cells - Eukaryotic cell structure and function...

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Eukaryotic cell structure and function
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Cell • The smallest unit of life having the capacity to live and reproduce
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Cell theory • All organisms are composed of one or more cells • Cell is the basic unit of live • All cells arise from previously existing cells
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Cell shapes and sizes
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Cell types • Prokaryotic cells (Bacteria, Archaea) • Eukaryotic cells (Eukarya)
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Prokaryotic cells • No nucleus • No membrane-bound organelles • Smaller in size • Single celled ( unicellular )
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• Single circular molecule of DNA localized in a nucleoid (no histones) • Cell division: by binary fission • No sexual recombination
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Prokaryotic Cell Structure pilus DNA flagellum cytoplasm with ribosomes capsule cell wall plasma membrane
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E.coli
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Eukaryotic cells • Nucleus • Membrane-bound organelles • Larger in size • Uni- or multicellular
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• DNA in the form of linear chromosomes localized in a nucleus (with histones) • Cell division: by mitosis • Sexual recombination: by meiosis
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Similarities • Both have plasma membrane • Both have DNA as their genetic material • Both produce 3 types of RNA
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Micro-04A-Cells - Eukaryotic cell structure and function...

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