BIOL 3380 Study Guide - Midterm Guide: Radiometric Dating, Telecom Enforcement Resource And Monitoring, Stromatolite
Document Summary
Composition of cell: dna 3%, lipid 9%, protein 55 to 60% (ribosomes most prevalent, gram positive bacterium. 600 da sized things: escherichia coli (e. coli, pseudomonas aeruginosa, salmonella. Gram positive and gram negative: positive anionic (negatively charged, covalently links sugars to pg (teichoic acid, covalently links sugars to cell membrane (lipoteichoic acid, anionic excluding negatively charged molecules, negative anionic. Cytoplasm: lps unique to gram negatives, lipid a conserved but can be actively modified, core (sugars attached to lipid a) conserved, o antigen (sugars attached to sugars with lipid a) highly variable. Extracellular surfaces and appendages: capsule polysaccharide or protein layer; places gel on top of cell, functions adherence, prevent desiccation, exclude detergents / viruses, Inhibits phagocytosis by immune cells: pili proteinaceous appendages; about 3 to 10 nm in width but can be micrometer long, functions motility (type 4 pili); bind to other bacteria; bind to human cells;
