Bio 102

Prokaryotes - Ch. 28 A) Chief distinguishing characteristics of prokaryotes be: 1. Their genetic material (DNA) is not enwrap within a membrane; it is maven card chromosome. 2. They deprivation other membrane-enclosed organelles. 3. Their DNA is not associated with hist ace proteins. 4. Their cell skirts well-nigh constantly contain the complex polysaccharide peptidoglycan. 5. They usually break open by binary fission. B) Prokaryotes include bacteria (eubacteria) and archaea (archaebacteria). The majority of cognise bacteria, including the photosynthesizing cyanobacteria, argon included in the eubacteria. C) Prokaryotic cell expression 1. There are a great many sizes and shapes among bacteria. more or less bacteria contrive from 0.2-2.0 um in diameter, and from 2-8 um in length. 2. They have a few basic shapes: spheric coccus, rod-shaped bacillus, and spiral. A. Cocci that detain in pairs after dividing are called diplococci; those that remain in grou ps of intravenous feeding are known as tetrads; those that remain in three-dimensional groups of eight are called sarcinae; those that contour grapelike clusters are called staphylococcus; those that remain attached in chainlike patterns are called streptococci. B. just about bacilli come out as single rods. Diplobacilli appear in pairs, and streptobacilli occur in chains. C.

Spiral bacteria have one or more twists. Bacteria that look like contract rods are called vibrios. 1) Others, called spirilla, have a spiraling shape, like a corkscrew, and fairly rigid bodies. 2) Another group of spirals a re verticillate and flexible; they are call! ed spirochetes. 3. Among the structures external to the prokaryotic cell palisade are the glycocalyx, flagella, axial filaments, fimbriae, and pili. A. The glycocalyx can take the form of a capsule (organized and firmly attached to cell wall), or a grime layer(unorganized and loosely attached to the cell wall). 1) Capsules often value unhealthful bacteria from...If you want to get a near essay, recite it on our website: OrderCustomPaper.com

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