Chem 1152 Chapter 28: Lipids
49. What type of lipid is represented below? a) A triacylglycerol b) A prostaglandin c) A wax d) A sphingolipid
c) A wax
39. Select the picture that best represents the structure of a lipid bilayer.
Lipid bilayer
47. What type of lipid is shown below? a) A fatty acid b) A thromboxane c) A fat d) A steroid
a) A fatty acid
52. What type of lipid is represented below? a) A phospholipid b) A phosphatidic acid c) A wax d) A triacylglycerol
a) A phospholipid
48. What type of lipid is represented below? a) A triacylglycerol b) A prostaglandin c) A wax d) A sphingolipid
a) A triacylglycerol
26. What is the defining characteristic of a lipid? a) All lipids are soluble in non-polar organic solvents. b) All lipids have structures based on a system of four fused carbon rings. c) All lipids have sulfur atoms in their structure. d) All lipids are esters.
a) All lipids are soluble in non-polar organic solvents.
31. Which of the following molecules is the parent molecule for steroids? a) Cholesterol b) Sphingosine c) Arachidonic acid d) Glucose
a) Cholesterol
30. What is the difference between saturated fatty acids and unsaturated fatty acids? a) Unsaturated fatty acids have double bonds, saturated fatty acids do not. b) Unsaturated fatty acids have an even number of carbons, saturated fatty acids have an odd number of carbons. c) Unsaturated fatty acids have cis double bonds, saturated fatty acids have trans double bonds. d) Unsaturated fatty acids are naturally occurring compounds, saturated fatty acids do not occur in nature and must be prepared synthetically.
a) Unsaturated fatty acids have double bonds, saturated fatty acids do not
44. Which of the following best describe the composition of lecithin? a) contains glycerol + 2 fatty acids + phosphoric acid + choline b) contains glycerol + 2 fatty acids + phosphoric acid c) contains glycerol + 3 fatty acids d) contains glycerol + 3 fatty acids
a) contains glycerol + 2 fatty acids + phosphoric acid + choline
41. Which of the following best describe the composition of sphingomyelin? a) contains sphingosine + 1 fatty acid + +Phosphoric acid + choline b) contains sphingosine + +Phosphoric acid + choline c) contains sphingosine + 1 fatty acid + galactose d) contains sphingosine + galactose
a) contains sphingosine + 1 fatty acid + +Phosphoric acid + choline
29. A sphingolipid always contains: a) sphingosine b) choline c) phosphatidic acid d) three fatty acids
a) sphingosine
51. Which statement is the most accurate? a) On average humans store about one week of energy as fat b) On average humans store about two to three weeks of energy as fat c) On average humans store about five to six weeks of energy as fat d) On average humans store about ten to twelve weeks of energy as fat
b) On average humans store about two to three weeks of energy as fat
37. Which of the following is not true of waxes? a) Some of them protect leaves and fruits. b) They tend to be soft because of the long carbon chains. c) They contain an ester bond. d) They are one of the most hydrophobic classes of lipids.
b) They tend to be soft because of the long carbon chains
25. For a compound to be classed as a lipid, it must: a) contain a glycerol unit b) be soluble in nonpolar solvents c) contain at least one fatty acid unit d) be soluble in water
b) be soluble in nonpolar solvents
33. The following is not involved in cholesterol transport. a) high density lipoprotein b) low density sterolprotein c) very low density lipoprotein d) low density lipoprotein
b) low density sterolprotein
50. Which statement is the most accurate? a) Fat molecules are approximately 25% carbon by mass b) Fat molecules are approximately 50% carbon by mass c) Fat molecules are approximately 75% carbon by mass d) Fat molecules are approximately 100% carbon by mass
c) Fat molecules are approximately 75% carbon by mass
34. Which of the following is not a characteristic of a cell membrane? a) The bilayer interior is formed from the hydrophobic regions of two adjoining layers of lipid molecules. b) The surface of the membrane is hydrophilic. c) Most of the membrane is composed of phospholipid. d) Proteins allow the transport of hydrophilic substances across the membrane.
c) Most of the membrane is composed of phospholipid.
40. What effect does the inclusion of cholesterol in a lipid bilayer membrane have on the properties of the membrane? a) The inclusion of cholesterol in the lipid bilayer allows the membrane to remain fluid and flexible at low temperatures. b) The inclusion of cholesterol in the lipid bilayer makes the membrane more permeable to polar molecules. c) The inclusion of cholesterol in the lipid bilayer adds rigidity to the membrane. d) The inclusion of cholesterol in the lipid bilayer blocks the transport of small polar molecules
c) The inclusion of cholesterol in the lipid bilayer adds rigidity to the membrane.
38. Which of the following is not true about phospholipids? a) They contain two fatty acid molecules. b) They have a hydrophobic region and a hydrophilic region. c) They contain three fatty acid molecules. d) They are found in cell membranes. Answer: c; Difficulty: Moderate; Reference: 28.5
c) They contain three fatty acid molecules.
42. Which of the following best describe the composition of cerebroside? a) contains sphingosine + 1 fatty acid + +Phosphoric acid + choline b) contains sphingosine + +Phosphoric acid + choline c) contains sphingosine + 1 fatty acid + galactose d) contains sphingosine + galactose
c) contains sphingosine + 1 fatty acid + galactose
27. A cephalin is also known as: a) sphingomyelin b) phosphatidyl serine c) phosphatidyl ethanolamine d) phosphatidyl choline
c) phosphatidyl ethanolamine
36. Which substance below is not a simple lipid? a) fat b) oil c) phospholipid d) wax
c) phospholipid
46. Which of the following compound lipids are not found in biological membranes? a) glycolipids b) cephalins c) steroids d) lecithins
c) steroids
53. Which is present in biological membranes? a) Phospholipids b) Sphingolipids c) Glycolipids d) Phospholipids, sphingolipids, and glycolipids are present in biological membranes
d) Phospholipids, sphingolipids, and glycolipids are present in biological membranes
45. Which of the following is not a type of compound lipid? a) Phospholipid b) Sphingolipid c) Glycolipid d) Steroid
d) Steroid
43. Which of the following best describe the composition of oil? a) contains 1 long chain fatty acid + a long chain alcohol b) contains 3 saturated fatty acid units c) contains 3 unsaturated fatty acid units d) contains glycerol +3 fatty acids
d) contains glycerol +3 fatty acids
35. Waxes are composed of: a) glycerol and three long-chain fatty acids. b) glycerol, two fatty acids and phosphoric acid. c) two fatty acids. d) one long chain fatty acid and one long chain alcohol
d) one long chain fatty acid and one long chain alcohol
28. Phosphatidyl choline is an example of a: a) glycolipid b) wax c) triacylglycerol d) phospholipid
d) phospholipid
32. Cholesterol is a: a) fat b) glycolipid c) phospholipid d) steroid
d) steroid