Lecture 20 - BIO 311C March 3 2008 Exam 2 will be held on Friday 7 March in this room The Discussion periods today and tomorrow will be devoted to

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BIO 311C March 3, 2008 Exam 2 will be held on Friday 7 March in this room The Discussion periods today and tomorrow will be devoted to a review for Exam 2. The last ~15 minutes of Wednesday’s lecture period will be available for you to ask questions about the subject matter covered in Exam 2.
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prokaryotic cell animal cell plant cell Biological membranes are essential components of all living cells. Illustrative examples: Two of their most important characteristics are their ability to: 1. physically and chemically separate aqueous spaces from each other, and 2. facilitate the transport of specific kinds of substances from the aqueous space on one side of the membrane to the aqueous space on the other side. *
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Electron microscope picture of a slice through a eukaryotic cell, showing slices through golgi bodies and vesicles. Simplified illustration of the cross-section of a typical biological membrane 8 nm Simplified Cross-sectional Appearance of a Biological Membrane phospholipid molecule I l u s t r a i o n f c e h g m b Textbook Fig 7.2, p. 125 *
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hydrocarbon hydrophobic bonding * Hydrophobic bonding only occurs when a nonpolar molecule or a nonpolar part of a molecule is forced into contact with water. water
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From textbook Figure 5.13, p. 76 * Polar head nonpolar (hydrophobic) tails Structure of a phospholipid structural formula space-filling formula illustration
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Organization of phospholipids in an aqueous solution See textbook Fig 7.2, p. 125 monolayer of phospholipids floating on top of water * monolayer bilayer of phospholipids immersed in water bilayer Polar lipids form a monolayer on the surface when exposed to aqueous solutions. They may form a bilayer when forced into the aqueous solution.
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I llustration of a Cross-section of a Liposome, an Artificial Membrane-bounded Organelle From: Freeman, Biological Science, Prentice Hall, Pub., 2002 * A liposome is a hollow sphere constructed of a phospholipid bilayer. Liposomes vary greatly in diameter,
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This note was uploaded on 03/23/2008 for the course BIO 311C taught by Professor Satasivian during the Spring '08 term at University of Texas at Austin.

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Lecture 20 - BIO 311C March 3 2008 Exam 2 will be held on Friday 7 March in this room The Discussion periods today and tomorrow will be devoted to

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