BIOL130L Study Guide - Midterm Guide: Aminoacyl Trna Synthetase, Aminoacyl-Trna, Exon Junction Complex
10 Nov 2013
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Document Summary
Two types of membrane transporter proteins: carrier and channel. Carrier is like a revolving door, solute attaches to solute binding site, then the protein moves it to wherever it needs to go. Channel is a channel in which ions pass through an aqueous pore from one side to another. They contrast as channels mostly detect size and charge as long as channel open, anything with that size/charge can pass. Carriers require that molecule fit a particular binding site; one molecule at a time can be transported. Membrane proteins are transporters, anchors, receptors and enzymes. Permeability- high to those like o2, co2, h20 is okay, urea will have trouble just like ions, glycerol can zip right through, if its fatty loving, it will be fine at getting inside (hydrophobic) Osmoconformers-marine organisms adjust internal salt concentrations to match seawater. Osmoregulators- regulate osmolarity through their bodies that is iso-osmotic with their cytoplasm.
