02:53Lipids | Fats, Steroids, and Phospholipids | Biological Molecules Simplified #42 Minute Classroom986views
Multiple ChoiceWhich type of fatty acids only contain Carbon-Carbon single bonds?a) Unsaturated.b) Saturated.c) Trans fats.d) Steroids.2832views28rank
Multiple ChoiceA triglyceride is a form of _______ composed of ___________.a) Lipid ; fatty acids & Glucose.b) Lipid ; Fatty acids & Glycerol.c) Carbohydrate ; Fatty acids only.d) Lipid ; Ribose.4330views26rank
Multiple ChoiceHow do phospholipids interact with water molecules?a) The polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract).b) Phospholipids do not interact with water because water is polar and lipids are nonpolar.c) The polar heads interact with water; the nonpolar tails do not.d) Phospholipids dissolve in water.7050views20rank
Multiple ChoiceThe molecule shown the figure is a ________.a) Fatty acid.b) Wax.c) Steroid.d) Triacylglycerol.e) Phospholipid.4319views17rank1comments
Multiple ChoiceChoose the correct statement about biological waxes:a) They contain at least one steroid molecule.b) They are fatty acids bound to long chain alcohol molecules.c) They are extremely hydrophilic.d) They are made of 4 fused carbon ring molecules.2483views20rank
Multiple ChoiceWhich of the following is a true statement comparing phospholipids and triacylglycerols (fats and oils)? 1595views
Multiple ChoiceLipids differ from other large biological molecules in that they __________. 1118views
Multiple ChoiceWhich of the following terms can be correctly used to describe compounds that do not mix with water? 729views
Multiple ChoiceNutritionally, saturated triacylglycerols are considered to be less healthful than unsaturated triacylglycerols. What is the difference between them? 1577views
Multiple ChoiceThe lipids that form the main structural component of cell membranes are __________. 1263views
Multiple ChoiceIf a small droplet of triacylglycerol molecules is suspended in water, the fat molecules form a "ball of spaghetti" with no particular orientation. But if a droplet of phospholipid molecules is put in water, all the molecules point outward, toward the water. Phospholipids are forced into this orientation because phospholipids have __________. 936views
Multiple ChoiceThe sex hormones estradiol and testosterone belong to which class of molecules? 2171views
Multiple ChoiceHigh cholesterol levels are considered a major risk factor for heart disease. If it is so bad for humans, why does the body make cholesterol in the first place? 1588views2rank
Multiple ChoiceManufacturers make vegetable oils solid or semisolid at room temperature by __________. 1419views
Multiple ChoiceSome lipids are formed when fatty acids are linked to glycerol. These subunits are linked together by __________. 1366views1rank
Multiple ChoiceThe fatty acid tails of a phospholipid are __________ because they __________. 1220views6rank
Textbook QuestionMacronutrients . a. include carbohydrates and vitamins; b. should make up a small percentage of a healthful diet; c. are essential in minute amounts to help enzymes function; d. include carbohydrates, fats, and proteins; e. are synthesized by cells and not necessary to obtain from the diet956views
Textbook QuestionWhat makes a fatty acid an acid? a. It does not dissolve in water. b. It is capable of bonding with other molecules to form a fat. c. It has a carboxyl group that can donate an H+ to a solution. d. It contains only two oxygen atoms.1225views
Textbook QuestionWhich of the following terms is least like the others? a. monosaccharide; b. phospholipid; c. fat; d. steroid; e. lipid689views
Textbook QuestionThe main constituents of the plasma membrane are . a. carbohydrates and lipids; b. proteins and phospholipids; c. fats and carbohydrates; d. fatty acids and nucleic acids1627views
Textbook QuestionUnsaturated fats a. have double bonds in their fatty acid chains. b. have fewer fatty acid molecules per fat molecule. c. are associated with greater health risks than are saturated fats. d. are more common in animals than in plants.1348views
Textbook QuestionWhich of the following substances is a major component of the cell membrane of a fungus? a. cellulose b. chitin c. cholesterol d. phospholipids895views
Textbook QuestionA fat molecule consists of . a. carbohydrates and proteins; b. complex carbohydrates only; c. saturated oxygen atoms; d. a carbon skeleton and fatty acids1241views
Textbook QuestionAnother aspect of the Nurses' Health Study looked at the percentage of change in the risk of coronary heart disease associated with substituting one dietary component for another. These results estimated that replacement of 5% of energy from saturated fat in the diet with unsaturated fats would reduce the risk of heart disease by 42%, and that the replacement of 2% of energy from trans fat with unsaturated fats would reduce the risk by 53%. Explain what these numbers mean.625views
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