Which of the following is TRUE regarding trans fat? It is less harmful than saturate fat It is commonly found in nuts and cold water fish Causes a fatty acid to have a "kink or bend" in the fatty acid structure It causes the fatty acid to appear and behave more like a saturated fat
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- Figure 2.17 Fatty acids. Double bonds in the tails are highlighted in red. A. The tail of stearic acid is fully saturated with hydrogen atoms. B. Linoleic acid, with two double bonds, is unsaturated. The first double bond occurs at the sixth carbon from the end of the tail, so linoleic acid is called an omega-6 fatty acid. Omega-6 and C. omega-3 fatty acids are essential fatty acids, which means your body does not make them and they must come from food. D. The hydrogen atoms around the double bond in oleic acid are on the same side of the tail. Most other naturally occurring unsaturated fatty acids have these cis bonds. E. Hydrogenation creates abundant trans bonds, with hydrogen atoms on opposite sides of the tail. Figure It Out: Are the double bonds in linolenic acid cis or trans?Unlike saturated fatty acids, the tails of unsaturated fatty acids incorporate one or more _______. a. phosphate groups b. glycerols c. double bonds d. single bondsEffects of Dietary Fats on Lipoprotein Levels Cholesterol that is made by the liver or that enters the body from food does not dissolve in blood, so it is carried through the bloodstream by lipoproteins. Low-density lipoprotein (LDL) carries cholesterol to body tissues such as artery walls, where it can form deposits associated with cardiovascular disease. Thus, LDL is often called bad cholesterol. Highdensity lipoprotein (HDL) carries cholesterol away from tissues to the liver for disposal, so HDL is often called good cholesterol. In 1990, Ronald Mensink and Martijn Katan published a study that tested the effects of different dietary fats on blood lipoprotein levels. Their results are shown in Figure 2.23. In which group was the level of LDL (bad cholesterol) highest?
- Effects of Dietary Fats on Lipoprotein Levels Cholesterol that is made by the liver or that enters the body from food does not dissolve in blood, so it is carried through the bloodstream by lipoproteins. Low-density lipoprotein (LDL) carries cholesterol to body tissues such as artery walls, where it can form deposits associated with cardiovascular disease. Thus, LDL is often called bad cholesterol. Highdensity lipoprotein (HDL) carries cholesterol away from tissues to the liver for disposal, so HDL is often called good cholesterol. In 1990, Ronald Mensink and Martijn Katan published a study that tested the effects of different dietary fats on blood lipoprotein levels. Their results are shown in Figure 2.23. In which group was the level of HDL (good cholesterol) lowest?Saturated fatty acids are so named because they are saturated with (a) hydrogen (b) water (c) hydroxyl groups (d) glycerol (e) double bondsEffects of Dietary Fats on Lipoprotein Levels Cholesterol that is made by the liver or that enters the body from food does not dissolve in blood, so it is carried through the bloodstream by lipoproteins. Low-density lipoprotein (LDL) carries cholesterol to body tissues such as artery walls, where it can form deposits associated with cardiovascular disease. Thus, LDL is often called bad cholesterol. Highdensity lipoprotein (HDL) carries cholesterol away from tissues to the liver for disposal, so HDL is often called good cholesterol. In 1990, Ronald Mensink and Martijn Katan published a study that tested the effects of different dietary fats on blood lipoprotein levels. Their results are shown in Figure 2.23. Figure 2.23 Effect of diet on lipoprotein levels. Researchers placed 59 men and women on a diet in which 10 percent of their daily energy intake consisted of cis fatty acids, trans fatty acids, or saturated fats. Blood LDL and HDL levels were measured after three weeks on the diet; averaged results are shown in mg/dL (milligrams per deciliter of blood). All subjects were tested on each of the diets. The ratio of LDL to HDL is also shown. Source, Mensink RP, Katan MB, Effect of dietary trans fatty acids on high-density and low-density lipoprotein cholesterol levels in healthy subjects. NEJM 323(7):43945. An elevated risk of heart disease has been correlated with increasing LDL-to-HDL ratios. Rank the three diets according to their predicted effect on cardiovascular health.
- Which of the following might be a feature(s) of a lipid that has been converted from a fully saturated fatty acid to a fatty acid containing several trans double bonds? Select all that apply. The trans fatty acid will now have a higher melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack more closely with saturated fatty acids, than with unsaturated fatty acids containing cis double bonds The trans fatty acid will now have a lower melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack most closely with unsaturated fatty acids containing cis double bonds, than with saturated fatty acidsTrans-fatty acids are synthetic forms of fatty acids made from altered unsaturated fatty acids. Trans-fatty acids are denser, solid at room temperature, and store more energy in the same unit of volume than unsaturated fatty acids. The production of trans-fatty acids involves the reorientation of one of the hydrogen atoms attached to a double-bonded car- bon atom, as illustrated in the figure below. unsaturated fatty acid OHHHHH HOC CCCC-c II I I HHHH trans-fatty acid |||| Molecular model of an unsaturated and trans-fatty acid Based on the structures shown above, H -C-C-C-C-C-H HHHHH TTTTT !!!!! HHHHH OHHHHH | ! ! ! ! ! HO-C-C-C-C-c-c IIII HHHH H HHHHH H HH III C-C-C-H I (a) Identify one property of all fatty acids. (b) Describe one of the functions of fatty acids in living systems. (c) Explain how the reorientation of the hydrogen atom as shown in the image allows the trans- fatty acids to be denser and solid at room temperature. Respond to each part in 3 to 5 complete sentences.Rank the following fatty acids from lowest melting temperature to highest melting temperature. A -0-c B-0-c -0-2 D-0-84 OBA mixed triglyceride contains: O A. three similar fatty acids esterified with glycerol B. two similar fatty acids esterified with glycerol O C. three different fatty acids esterified with glycerol all of the above 35When natural monounsaturated fats generally undergo the chemical process of partial hydrogenation, their fatty acid chains are converted into the following two forms: trans and saturated. O True FalseChoose the incorrect statement about fatty acids out of the following: The membrane lipids contain mostly unsaturated fatty acids The melting point of fatty acids decreases with increasing degree of unsaturation Naturally ocurring unsaturated long chain fatty acids are nearly all trans Lipids in tissues that are subject to cooling are more unsaturatedSEE MORE QUESTIONS
