Bacteriology

Chapter 27- bacteria and archaea Hypotonic hypertonic Lysis Mycoplasmas- bacteria that lack cell walls Gram positive bacteria- cell walls made of peptidoglycan Penicillin works on gram positive bacteria by preventing the synthesis of peptidoglycan Cell wall layers are: outermost is capsule, then lipopolysaccharide, then peptidoglycan, then phospholipids Cell wall is source of endotoxin Gram negative bacyeria- outer membrane with toxic lipopolysaccharides Plasmolysis- loss of water due to osmosis causes cytoplasm to pull away from cell wall Occurs in environments with high sugar content DNA should be located in the following to avoid cell death by adverse conditions, such as freezing, drying, or high temp: Nucleoid, endospore, plasmid