BIO 3124 Study Guide - Final Guide: Facilitated Diffusion, Electrochemical Gradient, Uniporter
Document Summary
Bio3124 final exam sheet topic 3 (bacterial anatomy) Dimensions: 1-4um, high ratio of surface area relative to volume favors diffusion and absorption, nutrient uptake and waste elimination, rapid growth, high cell density. Substance (rate of uptake: permeability barrier. Passive diffusion: transporter independent (dependent on membrane permeability) Facilitated diffusion: transporter dependent (independent of membrane permeability) Transport group translocation: passage and conversion of molecules as they pass through the membrane with an investment of energy, passage is dependent on a transporter, independent of a gradient. Antiporter: amphiphathic proteins, transmembrane proteins (integral): porins, uniporter, symporter, used for transport facilitated, active, group translocation. Porins: structures in the external membrane of gram-negative bacteria, facilitated diffusion of low molecular weight compounds, channels for small hydrophilic molecules, protein trimmers, semi-selective size, ionic properties, selective, used for facilitated diffusion or active transport. Symporters: selective, used for facilitated diffusion or active transport. Antiporters: selective, used for facilitated diffusion or active transport.
