keyconceptstopic6 - Topic 6: Lipids, Membranes, and...

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Topic 6: Lipids, Membranes, and Transport 1.) How do lipids differ from the 3 other classes of macromolecules? Unlike the other macromolecules (proteins, carbohydrates, and nucleic acids), lipids are nonpolar. Lipids also do not form polymers like the other three. 2.) What does “saturated” mean, in the context of fatty acids? Saturated tails mean the carbon carbon bonds in the tail each bond with 2 hydrogens. They are saturated with hydrogens. In unsaturated lipid fats, some of the carbon carbon bonds are double bonds (involving 2 pairs of shared elections). Leaving those carbons the ability to bond with only one hydrogen. They are “unsaturated” in the sense that they have not bonded with the maximum number of hydrogens. What is the effect on the shape of the fatty acid if it is not saturated? Saturated fatty acid tails make straight linear shapes, and thus can pack tightly together as solids at ambient temperatures. Unsaturated fatty acid tails have kinks in them, due to the double bonds, so they cannot pack tightly, and stay liquid at ambient temperatures. Which are liquid or solid? Why? Saturated fats are solid and unsaturated fats are liquid. The larger and the more saturated the fatty acid tail, the more solid it becomes. The shorter and less saturated the fatty tail is, the more liquidated it becomes. 3.) Which kinds of fats can be problems in human diets: saturated, unsaturated, polyunsaturated, or partially hydrogenated? Saturated fats are hard for the human to metabolize. They contribute to coronary artery disease and heart attacks. Partially hydrogenated fats are similar to saturated fats. They are just as bad as saturated fats, and perhaps even worse. 4.) What is special about phospholipids and how are they able to form barriers in cells?
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This note was uploaded on 11/08/2010 for the course BIO 12334343 taught by Professor Jony during the Fall '09 term at University of Arizona- Tucson.

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keyconceptstopic6 - Topic 6: Lipids, Membranes, and...

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