Chapter 27

Chapter 27 - BIO 152 Notes Chapter 27: Prokaryotes...

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BIO 152 Notes Chapter 27: Prokaryotes *classified in 2 domains (Archaea, Bacteria) Concept 27.1 * 3 common chapes [sphere (cocci), rod (bacilli), spirals] peptidoglycan – network of modified-sugar polymers linked by short polypeptides (in most prok.’s cell walls), not in archaeans (they have polysaccharides and proteins) gram positive – bacteria with peptidoglycan on the outside and a less complex cell wall gram negative – less peptidoglycan, lipopolysaccharides, and more complex, more harmful to humans capsule – covers cell wall, sticky layer of polysaccharides/proteins fimbriae – hair-like appendage, more numerous and shorter than pili pili – some specialized pili link cells during conjugation *about half of all proks. are capable of directional movement taxis – the movement toward or away from a chemical stimulant nucleoid region – space where the chromosome of a prok. hangs out plasmids – little rings of DNA that are accessories to the single chromosome, replicate on
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Chapter 27 - BIO 152 Notes Chapter 27: Prokaryotes...

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