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Unformatted text preview: Lecture 2 Microbial Anatomy and Genetics Basic Cell Structure Cell the basic structural and functional unit of all organisms; cells may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals All cells have: Plasma membrane a thin membrane around the cytoplasm of a cell; controls passage of substances in and out of the cell Cytoplasm All of the substance of a cell outside of the nucleus. The cytoplasm contains a number of different types organelles such as the mitochondria. Region of DNA Prokaryotic cells DNA in a nucleoid region Eukaryotic cells DNA within the nucleus Basic Types of Cells Prokaryotic before the nucleus found only in bacteria smallest and simplest of all living cells 0.2 2.0 um in diameter 2 8 um long lack a nucleus lack membrane bound organelles Bacterial DNA Nucleoid Single bacterial chromosome Not contained within a membrane Plasmid Bacterial DNA outside of nucleoid Supplemental DNA Bacterial cell wall Surrounds and protects the cell Consists of peptidoglycan (carbohydrate attached to protein) Gram-positive bacteria Many layers of peptidoglycans (thick) Bluish...
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