Bio 102

Prokaryotes - Ch. 28 A) Chief distinguishing characteristics of prokaryotes be: 1. Their genetic material (DNA) is non enwrap within a membrane; it is maven beak chromosome. 2. They deprivation other membrane-enclosed organelles. 3. Their DNA is not associated with hist i proteins. 4. Their cell skirts approximately constantly contain the complex polysaccharide peptidoglycan. 5. They usually secernate 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 organise 1. There are a great many sizes and shapes among bacteria. close 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 go along in pairs after dividing are called diplococci; those that remain in groups o f four-spot are known as tetrads; those that remain in cube-shaped 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. or so 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 snub rods are called vibrios. 1) Others, called spirilla, have a spiraling shape, like a corkscrew, and fairly rigid bodies. 2) Another group of spirals are helical and flexible; the y are called spirochetes. 3. Among! the structures external to the prokaryotic cell breakwater 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 hold dear unhealthful bacteria from...If you want to get a fully essay, recite it on our website: OrderCustomPaper.com

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