BIOSC 150 1nd Edition Lecture 6 Outline of Last Lecture I. Hemoglobin and diseases Outline of Current Lecture II. MembranesA. Transportation across a membraneIII. OsmosisIV. DiffusionCurrent Lecture-Movement across the membrane can be measured-Experiments measure membrane permeability-Chemicals establish equilibrium across a permeable membrane by random movements-A net movement of water dilutes solute-Osmosis can shrink or burst vesicles-Ions must be moved across the membrane to create cell gradients -Membranes also contain embedded proteins and glycoproteins-Membrane proteins do many jobs1. Transporters2. Anchors3. Receptors4. Enzymes-Nonpolar R groups predominate in the membrane -Membrane proteins generate electrochemical gradients-Transport is classified as diffusion, facilitated diffusion and active transportThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-Carriers and channels both facilitate diffusion-Passive carriers and active transports both change shape in moving solutes-Membrane channels and transporters are highly selective-Channel access may be regulated-Carrier proteins facilitate diffusion down a gradient and function via solute binding and conformational change-Active transporters move substances against an electrochemical gradient and require energy
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