BIOL 1001 Chapter : Learning Objectives Number 2 2

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15 Mar 2019
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Membranes and membrane function (chapter 7 of the textbook) The membrane contains two layers a hydrophilic head and a hydrophobic tail. A model describing the structure of the cell membrane. A membrane remains fluid as temperature decreases until the phospholipids settle into a closely packed arrangement and the membrane solidifies. There are kinks in the tails where double bonds are located, unsaturated hydrocarbon tails cannot pack closely as saturated hydrocarbon tails, and this makes the membrane more fluid. A membrane is held together primarily by hydrophobic interactions, which are much weaker than covalent bonds. It allows membrane lipids and some proteins to shift laterally. Henrique and hanson performed experiments with pigs and examined the effects on the relative amounts of saturated and unsaturated fats. One can see similar patterns comparing species with different body temperature or cells grown at different culture temperatures. What types of molecules can move easily across the membrane? (e. g. polar, nonpolar, large, small)

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