NUTR 1010 Chapter Notes -Trans Fat, Lipoprotein, Phospholipid

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25 Mar 2013

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Fats and oils are forms of a larger and more diverse group of substances called lipids; most lipids are insoluble in water. The three types of lipids commonly found in foods are triglycerides, phospholipids, and sterols. Most of the fat we eat is in the form of triglycerides; a triglyceride is a molecule that contains three fatty acids attached to a glycerol backbone. The various fatty acids in triglycerides are classified based on chain length, level of saturation, and shape. Short-chain fatty acids are usually fewer that six carbon atoms in length; medium-chain fatty acids are six to twelve carbons in length, and long-chain fatty acids are 14 or more carbons in length. Saturated fatty acids have no carbons attached together with a double bond, which means that every carbon atom in the fatty acid chain is saturated with hydrogen. Monounsaturated fatty acids contain one double bond between two carbon atoms; monounsaturated fatty acids are usually liquid at room temperature.

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64. Which of these statements about fatty acids are false? A. The physical state of a triglyceride with three unsaturated fatty acid tails would be a clear liquid. B. Complex lipids that contain mainly unsaturated fatty acids are liquids (oils) at room temperature C. Its best to use fats with high melting points in our diet. D. A disadvantage of the ability of saturated fats to pack tightly is that tightly packed, saturated fats clog arteries as atherosclerosis 65. Trans fatty acids A. are formed when vegetable oil is hydrogenated (for solidification). B. are found in fried foods C. have an atypical shape that affects their chemical activity D. are not flexible and can adhere to surfaces E. should be avoided because they are composed of partially hydrogenated (partially hardened) oils F. are all of the above 66 Which of these statements about fatty acids are false? A. When plants and animals build fatty acids they make the trans forms. B. Food manufacturers found that foods like chips with the trans form have a longer "shelf life" C Natural cis fatty acids tend to turn rancid and spoil D Although natural cis fatty acids turn rancid and spoil, it is the cis form that is used by the body. E.The process of hydrogenation, in which hydrogens are added to unsaturated fats, produces a mixture of saturated fatty acids and standard and trans forms of unsaturated fatty acids 67. Good tips for reducing dietary fats are to A. use non-fat or low-fat dairy products and other products B use low-fat cooking methods C bake, roast, steam, broil, stir fry, microwave D. seldom have fried foods E choose lean cuts of meat, trim fat F. do all the above 68. Which of these statements about the properties of fatty acids are true? A. Melting point of all fatty acids increases with increasing hydrocarbon chain length (i.e increasing size) B cis double bonds prevent good alignment of molecules in unsaturated fatty acids leading to C Melting point of unsaturated fatty acid are lower than that of a saturated fatty acid with the D. The melting point of a saturated fatty acid is greater than that of an unsaturated fatty acid of poor packing same number of carbon atoms due to the presence of their double bonds the same chain length, because saturated fatty acid chains tend to be fully extended and to stack in a regular structure, thereby causing increased intermolecular attraction. E. all of the above 69. Freebie 70 Freebie

NUTR 1010 Chapter Notes -Trans Fat, Lipoprotein, Phospholipid

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