BIOL 150B Chapter Notes - Chapter 5: Lipid Bilayer, Membrane Transport, Pinocytosis
28 Jan 2016
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Document Summary
Endocytosis: vesicular uptake of molecules from the extracellular uid. Pinocytosis: non-speci c uptake of uid & small molecules. Receptor-mediated endocytosis: selective uptake of speci c molecules: mediated by cell membrane receptors, form coated vesicles, exocytosis: vesicular removal of molecules to the extracellular uid. For particles to big for membrane transport. Hydrophilic heads point outward, exposed to water, forming weak. More unsaturated fatty tails = greater uidity. More saturated fatty tails = less uidity. Act as catalysts, speeding up enzyme reactions. Transport ions & molecules in & out of the cell. Dispersion of atoms/molecules/ions result of thermal motion. Temperature & [ ] gradient = faster the rate of diffusion. Temperature & [ ] gradient, lipid solubility, size = faster rate: facilitated diffusion: ions or large polar molecules requiring a protein in. Carrier proteins: loosely binds to certain molecules, resulting in a. Channel proteins: form pores to allow molecules to pass through. Solutes reduce the concentration of free molecules in a solution.
