[BIO1140] - Final Exam Guide - Everything you need to know! (74 pages long)
29 Nov 2016
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No, way too big, can"t diffuse through membrane ( larger than 100 daltons) No, way too big, cant diffuse through ( larger than. Passive transport: is defined as the movement of a substance across a membrane without the need to expend chemical energy, such as atp. What drives this transport is diffusion; the net movement of a substance from a region of higher concentration, to a region of lower concentration (downhill movement). For solutes without a charge, a concentration gradient must be built. Osmosis: the passive transport of water across a selectively permeable membrane in response to solute concentration gradients, a pressure gradient, or both. *partition coefficient: ratio of solubility in organic solvent to that in water. Simple diffusion: mechanism by which certain small substances diffuse through the lipid part of biological membrane. (small, lipophilic molecules) Two types of proteins are used to carry out this diffusion; channel and carrier.
