15. Glycogen is structurally similar to which of the following? A). amylopectin
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Question
15. Glycogen is structurally similar to which of the following? A). amylopectin B). amylose C). cellulose D). none of the above
16. Which of the following contains (1 4) glycosidic bonds? A). amylopectin B). amylose C). cellulose D). all of the above
17. Triglycerides (triacylglycerols) belong to which class of compounds? A). alcohols B). carboxylic acids C). esters D). ethers
18. Which of the following triacylglycerols is most likely to be a solid fat? A). one which contains relatively short chain saturated fatty acids B). one which contains relatively short chain unsaturated fatty acids C). one which contains long chain saturated fatty acids D). one which contains long chain unsaturated fatty acids
19. Saturated fatty acids have higher melting points than unsaturated fatty acids because A). they have fewer hydrogen atoms. B). they have more hydrogen atoms. C). their molecules fit closely together. D). the cis double bonds give them an irregular shape. E). the trans double bonds give them an irregular shape.
20. The skeletal structure of oleic acid is shown below. Oleic acid is a A). saturated fatty acid. B). polyunsaturated fatty acid. C). monounsaturated fatty acid. D). strong acid. E). monosaturated fatty acid.
21. .Linoleic acid is a ___________ A). saturated fatty acid. B). polyunsaturated fatty acid. C). monounsaturated fatty acid. D). strong acid.
22. Waxes belong to which class of compounds? A). alcohols B). carboxylic acids C). esters D). ethers
23. Which of the following fatty acids has the HIGHEST melting point? A). Arachidonic acid (20 carbons, polyunsaturated fatty acid) B). Oleic acid (18 carbons, monounsaturated fatty acid) C). Stearic acid (18 carbons, saturated fatty acid) D). Lauric acid (12 carbons, saturated fatty acid)
24. Which of the following type of reaction is involved in saponification? A). condensation B). dehydration C). hydrogenation D). hydrolysis
25. Which of the following best describes the components of phospholipids? A). glycerol, one fatty acid, two phosphate groups, and an alcohol B). glycerol, two fatty acids, a phosphate group, and an alcohol C). either of these, depending on the identity of the phospholipid D). none of the above
26. In glycerophospholipids where is the phosphate group attached to glycerol? A). at the middle carbon only B). at a terminal carbon only C). at either the middle or a terminal carbon D). at both the middle and a terminal carbon
27. Margarine containing partially hydrogenated soybean oil is solid because A). it contains only saturated fats. B). it contains only trans fatty acids. C). some of its double bonds have been converted to single bonds. D). it contains only cis double bonds. E). it contains only polyunsaturated fatty acids.
28. Hydrogenation of unsaturated fatty acids produces what undesired side product? A). Cis-fatty acids B). Trans-fatty acids C). Saturated fatty acids D). Unsaturated fatty acids
29. Lipid membranes have how many layers? A). 1 B). 2 C). 3 D). 4
30).Identify the class of lipid to which each of the following molecule belongs. A). steroid B). glycerophospholipid C). wax D). triacylglycerol E). prostaglandin
Explanation / Answer
15. A. Amylopectin
Glycogen is structurally similar to amylopectin.
16. D). all of the above
17. C. esters
A fatty acid is a long chain of carbon atoms bonded to hydrogen atoms, and contains carboxylic acid group at one end. When the carboxyl group of fatty acid is reacted with the –OH group of glycerol, “dehydration synthesis reaction” takes place. In this reaction, three molecules of water are produced, and glycerol is connected with the three fatty acids by an ester linkage and forms a “triglyceride.”
18. C). one which contains long chain saturated fatty acids
Long chain saturated fatty acids have high melting points, physically they appear as solids.
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