Chapter 9 - Lipids and Biological Membranes

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enthalpic contribution), whereas )S is fairly large and positive (entropically favorable). This isbecause water becomes much less structured if it is removed from intimate contact withhydrophobic groups (figure 9-13).Thehydrophobic effect is largely responsible for spontaneous assembly of amphipathicphospholipids into amphipathic, noncovalent strutures as well. Phospholipids, however,spontaneously assemble into bilayers because of the added steric effects of the additionalaliphatic R group. Figure 9-14 demonstrates the steric crowding resulting from the additionalaliphatic “tail.”The crowding is relieved by formation of a bilayer. Bilayer sheets will spontaneously formwater-filled enclosures. 9-15.
Phospholipidbilayers are noncovalent, dynamic structures in which individual lipids are mobile. Types oflipid movement are transverse diffusion (flip-flop), which is slow, and lateral diffusion, which ismuch faster. Lateral and transverse diffusion are illustrated in Figure 9-16
Page 1 and 2: Chapter 9 - Lipids and Biological M
Page 3 and 4: HCC CH 2 ONO 2-H 3+SerineOHOH OHOHO
Page 5 and 6: SphingolipidsThese phospholipids ar
Page 7 and 8: the metabolic precursor of steroid
Page 9: Other LipidsIsoprenoids are built f
Page 13 and 14: portion of glycophorin (Figure 9-20
Page 15 and 16: antiparallel beta sheet rolled up i
Page 17 and 18: Membrane StructureThe technique of
Page 19 and 20: Spectrin, comprised of two similar

Chapter 9 - Lipids and Biological Membranes

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