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 pear-shaped chromosome. 2. They deprivation other membrane-enclosed organelles. 3. Their DNA is not associated with hist 1 proteins. 4. Their cell skirts just about constantly contain the complex polysaccharide peptidoglycan. 5. They usually burst by binary fission. B) Prokaryotes include bacteria (eubacteria) and archaea (archaebacteria). The majority of cognize bacteria, including the photosynthesizing cyanobacteria, argon included in the eubacteria. C) Prokaryotic cell grammatical construction 1. There are a great many sizes and shapes among bacteria. well-nigh 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 watch in pairs after dividing are called diplococci; those that re main in groups of iv are known as tetrads; those that remain in cuboidal 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. around 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 arc 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 coiling and flexible ; they are called spirochetes. 3. ! Among the structures external to the prokaryotic cell skirt 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 nurture unhealthful bacteria from...If you want to get a bountiful essay, recite it on our website: OrderCustomPaper.com

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