SOLVED

21) Which of the following readily dissolve in nonpolar solvents? A) proteins B) nucleic acids C) glycine D) lipids E) enzymes 22) Which of the following fatty acids is unsaturated? A) palmitic acid B) oleic acid C) myristic acid D) stearic acid 23) Saponification of 1 mole of glyceryl dibutyrooleate with excess potassium hydroxide would yield which of the following products? A) 2 moles of potassium butyrate, 1 mole of potassium oleate B) 1 mole of glycerol, 1 mole of potassium oleate, 2 moles of potassium butyrate C) 2 moles of potassium butyrate D) 1 mole of glycerol, 2 moles of butyraldehyde, 1 mole of olealdehyde E) 1 mole of glycerol, 1 mole of potassium decanoate, 2 moles of potassium butyrate 24) A typical E. coli bacterium is a cylindrical cell about 2 μm long and 1 μm in diameter, weighing about 1.8 × 10-12 g and containing 80% water by volume. Calculate the number of lipid molecules present, assuming their average molecular weight is 688 and the lipid content is 1.9%. A) 8.3 × 1010 B) 2.1 × 1010 C) 2.4 × 107 D) 1.6 × 109 E) 3.0 × 107 25) Enantiomers ALWAYS: A) have an asymmetric carbon B) have different physical properties C) change the color of light D) rotate polarized light E) have different chemical properties 26) Which of the following is a polysaccharide? A) ribose B) fructose C) glucose D) glycogen E) pentose 27) Compounds which are optical isomers of one another but differ in physical and chemical properties are known as what? A) geometric isomers B) enantiomers C) racemic compounds D) allotropes E) diastereomers 28) Choose the INCORRECT statement. A) Unsaturation in a fat or oil can be removed by hydrogenation. B) Unsaturation can be removed by the catalytic addition of hydrogen. C) Removing unsaturation raises the melting point of the fat or oil. D) Margarines are oils, fortified with color. E) Fats and oils become rancid when exposed to heat, air, and light. 29) Choose the INCORRECT statement. A) The simplest carbohydrates are the oligosaccharides. B) Mono- and oligosaccharides are called sugars. C) Polysaccharides contain more than 10 monosaccharide units. D) Starch and cellulose are polysaccharides. E) The general term for all carbohydrates is glycoses. 30) Choose the INCORRECT statement. A) Two molecules that are nonsuperimposable mirror images of one another are optical isomers. B) Enantiomers are molecules that are mirror images of one another which are superimposable. C) A dextrorotatory isomer rotates plane polarized light to the right. D) Optical isomers generally have one carbon with 4 different groups attached to it. E) A carbon atom with 4 different groups attached to it is called a chiral center.