[BIO130H1] - Final Exam Guide - Everything you need to know! (82 pages long)
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BIO130H1 Full Course Notes
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Document Summary
Small, uncharged polar molecules are generally not able to pass through(except for water) Movement via simple diffusion through the lipid bilayer. 2) the more hydrophobic or nonpolar the molecule is, All membrane transport proteins are multipass transmembrane proteins. Multipass means they weave the membrane more than once. Note: does not mean they are all multiple alpha helices. Transport polar and charged molecules ions, sugars, amino acids, nucleotides, various cell metabolites. Each transport protein is selective transport specific class of molecules. Concentration gradient (the arrow is not necessarily the direction of transport) Channel protein do passive transport; transporter protein can do both. Channel proteins do not interact a lot, do not bind strongly to the transported molecule. Some mediated active, and some passive transport. Concentration gradient + membrane potential (electrical gradient ) = electrochemical gradient. Electrochemical gradient: depends on what you are looking at. Membrane potential: a total difference in charge across the membrane.
