MICRB265 Lecture Notes - Lecture 16: Tetrapeptide, Cell Membrane, Glycan

• School: University of Alberta
• Department: Microbiology (Biological Sciences)
• Course: MICRB265
• Professor: Perrin Beatty

Document Summary

Tryptophan and glucose are difficult to transport active transport may be required. Chloride ions, potassium ion, sodium ion are very difficult to transport active transport required. Gram positive; monoderm phyla"s firmicutes and actinobacteria. have a thick layer of. Gram negative diderm, have an outer layer all other known phyla. have a thin layer of peptidoglycan. one membrane around cytoplasmic membrane. peptidoglycan. two membranes (cytoplasmic membrane and outer membrane). Cells stained uniformly with insoluble crystal violet-iodine complex. Cells are decolorized with alcohol gram +ve peptidoglycan is dehydrated. Gram -ve bacteria are counter stained with safranin and become pink. Examples: gram +ve bacillus cereus (note this species is pleomorphic) . gram -ve . Gram +ve and -ve have pg (peptidoglycan) linkages. Rigid layer that provides strength (more strength than outer layer) composed of; Alternating modified glucose (n-acetylglucosamine and n-acetylmuramic acid) in b-1,4. Amino acids l-alanine, d-alanine, d-glutamic acid, and either l-lysine or diaminopimelic.