Practice questions Exam 3 .docx

Practice questions Exam 3 .docx - Chapter 18 1 The reaction...

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Chapter 18 1. The reaction of a cyclic monosaccharide with an alcohol, in the presence of H + , will produce: a. a sugar alcohol b. a glycoside c. a disaccharide d. a sugar acid 2. The glycosidic bond shown in this compound is classified as: a. (1 2) b. (1 4) c. β (1 6) d. (1 4) 1
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3. The oxidation of monosaccharides produces: a. sugar alcohols b. disaccharides c. trisaccharides d. sugar acids 4. Choose the structure that contains three chiral centers: 5. Which of the following properties would be the same for a pair of enantiomer monosaccharides? a. solubility in water b. interaction with plane-polarized light c. reaction rate in glucose d. more than one correct response 6. Choose the correct characteristics of the following monosaccharide: 2
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a. D-form, configuration b. D-form, configuration c. L-form, configuration d. L-form, configuration 7. Choose the correct characteristics of the following monosaccharide: a. D-form, configuration b. D-form, configuration c. L-form, configuration d. L-form, configuration 8. Which of the following monosaccharides has a structure in which two or more chiral centers are present? a. Glyceraldehyde (2,3-Dihydroxypropanal) b. Dihydroxyacetone (1,3-Dihydroxypropanone) c. Glucose d. more than one correct response 3
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9. The rotation (CW or CCW) of plane polarized light by a specific enantiomer depends on: a. The identity of the monosaccharide b. The concentration of the monosaccharide c. The specific form (D or L) of the enantiomer d. No correct response 10. Which of the following statements concerning the D- and L- forms of a monosaccharide is incorrect ? a. They have structures that are nonsuperimposable mirror images of each other b. They are enantiomers c. They must contain the same number of chiral centers d. No correct response 11. Which set of structures represents both epimers and diastereomers? 4
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12. Aldoses are reducing sugars because in their non-cyclic form they contain: a. An aldehyde group b. A hydroxyl group c. A ketone group d. An ester group 13. Which of the following statements is false? a. There can never be more than two enantiomers for a molecule. b. Glucose is both a hexose and a ketose. c. Complete hydrolysis of an oligosaccharide produces only monosaccharides. d. A positive Tollen's test classifies a monosaccharide as a reducing sugar.
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