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D and L notations used in describing the stereochemistry of carbohydrates ____________.


A) are directly related to the R and S notation.
B) are directly related to the (+) and (?) notation.
C) are used to describe the asymmetric carbon farthest from the carbonyl group
D) are directly related to how the molecule rotates plane-polarized light
E) are used to describe the uppermost asymmetric carbon atom

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Which reagent(s) will selectively react with aldoses but will not react with ketoses?


A) Br2/H2O
B) Ag+, NH3, HO?
C) HNO3
D) A and B
E) B and C

Correct Answer

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D-Glucose units joined by beta-1,4?-glycosidic linkages are not digestible by humans because____________.


A) humans lack the enzyme necessary to hydrolyze this linkage
B) all groups being equatorial in the glucose rings make the chains too stable to digest
C) it is a glycoside and, therefore, indigestible
D) it is unbranched and, therefore, indigestible
E) all the above

Correct Answer

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How many stereoisomeric D-2-ketohexoses are possible?


A) 1
B) 2
C) 3
D) 4
E) 5

Correct Answer

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Which of the following carbohydrates is D-glucose?


A) Which of the following carbohydrates is D-glucose? A) B) C) D) E)
B) Which of the following carbohydrates is D-glucose? A) B) C) D) E)
C) Which of the following carbohydrates is D-glucose? A) B) C) D) E)
D) Which of the following carbohydrates is D-glucose? A) B) C) D) E)
E) Which of the following carbohydrates is D-glucose? A) B) C) D) E)

Correct Answer

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Which of the following D-hexoses can be converted to D-ribose by a Wohl degradation?


A) D-allose
B) D-glucose
C) D-galactose
D) D-talose
E) C and D

Correct Answer

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The Kiliani-Fischer synthesis (below) gives which two C-2 epimers? The Kiliani-Fischer synthesis (below) gives which two C-2 epimers? A) allose/altrose B) gulose/idose C) glucose/mannose D) galactose/talose E) sucrose/fructose


A) allose/altrose
B) gulose/idose
C) glucose/mannose
D) galactose/talose
E) sucrose/fructose

Correct Answer

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Which D-aldohexose in its beta-D-pyranose form has only one OH group in the axial position?


A) D-allose
B) D-galactose
C) D-gulose
D) D-iodose
E) D-talose

Correct Answer

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Which of the following terms best describes an aldohexose? 1) A monosaccharide 2) A disaccharide 3) An aldehyde 4) A complex carbohydrate


A) 1 and 3
B) 2 and 3
C) 2 and 4
D) 1, 3, and 4
E) 2, 3, and 4

Correct Answer

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A

Which of the following is a reducing sugar?


A) Which of the following is a reducing sugar? A) B) C) D) E) all of the above
B) Which of the following is a reducing sugar? A) B) C) D) E) all of the above
C) Which of the following is a reducing sugar? A) B) C) D) E) all of the above
D) Which of the following is a reducing sugar? A) B) C) D) E) all of the above
E) all of the above

Correct Answer

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D

Which of the following Haworth projections is ?-D-glucose?


A) Which of the following Haworth projections is ?-D-glucose? A) B) C) D) E)
B) Which of the following Haworth projections is ?-D-glucose? A) B) C) D) E)
C) Which of the following Haworth projections is ?-D-glucose? A) B) C) D) E)
D) Which of the following Haworth projections is ?-D-glucose? A) B) C) D) E)
E) Which of the following Haworth projections is ?-D-glucose? A) B) C) D) E)

Correct Answer

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B

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