Lecture 1 - Cell Morphology and Structure- Prokaryotes

Lecture 1 - Cell Morphology and Structure- Prokaryotes - 1...

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Unformatted text preview: 1 Cell Morphology and Structure PROKARYOTES How big (or small??) is a microorganism? Fig. 4.25 2 Prokaryotes vs. Eukaryotes • no true nucleus (no membrane surrounds DNA) • single, circular chromosome • 70s ribosomes • no membrane-bound organelles are present • no microtubules • no cytoplasmic streaming occurs • small cell size • membrane-bound nucleus contains chromosomal DNA • several chromosomes • 80s ribosomes in cytoplasm, 70s ribosomes in organelles • membrane-bound organelles present • cytoskeleton (microtubules and microflaments) present • cytoplasmic streaming occurs • larger cell size Prokaryotic and Eukaryotic Cells Bacterium in intercellular space oF leaF mesophyll. 3 A typical prokaryotic cell is much smaller than a typical eukaryotic cell… Small, rod-shaped bacteria on the surface of a human cheek cell. Bacterial Shapes and Arrangements Fig. 4.22 4 Diagram of a typical bacterial cell Not from your book. Bacteria as seen with the transmission electron microscope Citromicrobium Pantoea stewartii 5 Rod-shaped and spiral bacteria have fbers oF actin-like protein just beneath the cell membrane ¡ig. 4.20 These help determine wall deposition and cell shape. E. coli cells stained with acridine orange to visualize nucleic acids Cells stained with acridine orange and viewed with a ¢uorescence microscope. DNA ¢uorescence is yellow- green and RNA ¢uorescence is red. 6 The DNA in a typical bacterium is about 1000 times longer than the cell itself!!...
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This note was uploaded on 03/26/2008 for the course MICROBIOLO 201 taught by Professor Edwardbraun during the Spring '07 term at Iowa State.

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Lecture 1 - Cell Morphology and Structure- Prokaryotes - 1...

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