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CH ENGR 104C Lecture 2: notes_14C_lipids

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7 Feb 2017

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Lipids are organic compounds that contain hydrocarbons which are the foundation for the structure and function of living cells. Lipids are non polar so they are soluble in nonpolar environments thus not being water soluble because water is polar. An 18-carbon fatty acid an 18-carbon fatty acids with no double bonds with one double bond. As the following data indicate, the saturated acids have higher melting points than unsaturated acids of corresponding size. If a fatty acid has more than one double bond then this is an indication that it is a polyunsaturated fatty acid. The fatty acids most frequently found in nature are shown in the table below. Most naturally occurring fatty acids contain an even number of carbon atoms and are unbranched. 2. Saturated fatty acids have higher melting points due to their ability to pack their molecules together thus leading to a straight rod-like shape.

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Related Questions

58. Which of the following are organie acid anions A. lactate B. acetoacetate C. phosphate D. sulfate E A& B only 59Â·Among the mechanisms that help maintain pH of arterial blood between 7.35 and 7.45 are A. Buffer systems, B exhalation of CO2, C kidney excretion of H+ D kidney reabsorption of HCO3 E all of the above 60. Which of these statements about the kidneys role in buffering is true? A. The kidneys play an important role in the control of acidosis by responding with an increase in the excretion of H+ B In conditions of acidosis the kidney will increase the production of NH3 from tubular amino acids or amino acids absorbed from the plasma. C. Renal regulation of H+& HCO3- final defense, slow but very effective D. Marked brain damage is seen in cases of failure to make urea via the urea cycle or to eliminate urea through the kidneys E all of the above 61.Select the false statement about saturated fatty acids from those below. Saturated fatty acids A. have all single bonds and have a maximized number of hydrogens attached to the carbons B. are linear and inflexible, because they are more tightly stacked! C have higher melting points than unsaturated fatty acid with the same number of carbons D Typical saturated fatty acids are tightly packed together E none of the above 62 Select the false statement about unsaturated fatty acids from those below. A. Unsaturated fatty acids usually have more than one double bond. B An unsaturated fatty acid has one or more carbon-carbon double bonds in the chain C A double bond introduces a kink in the molecular structure of unsaturated fatty acids. D Kinks in unsaturated fatty acids prevent stacking and lend flexibility E. The melting points of unsaturated fatty acids are usually lower than those of saturated fatty acids. 63. Which of these statements about fatty acids are false? A. The first double bond in a saturated fatty acid is usually at the ninth carbon B. Most double bonds are not conjugated, are usually cis and result in a bent chain and lower melting point C. There is a decrease in melting point with increased unsaturation of the fatty acid D. The notation 14:0 means 14 carbons and 0 double bonds in the molecule (saturated). E. The notation 18:2 means 18 carbons in the molecule and 2 double bonds