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Micro Lecture 2

Micro Lecture 2 - Lecture 2 Microbial Anatomy and Genetics...

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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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Micro Lecture 2 - Lecture 2 Microbial Anatomy and Genetics...

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