BIOSC 150 1nd Edition Lecture 6 Outline of Last Lecture I Hemoglobin and diseases Outline of Current Lecture II Membranes A Transportation across a membrane III Osmosis IV Diffusion Current 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 jobs 1 2 3 4 Transporters Anchors Receptors Enzymes Nonpolar R groups predominate in the membrane Membrane proteins generate electrochemical gradients Transport is classified as diffusion facilitated diffusion and active transport These 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 input
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