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- Define the following terms: a. reducing sugar b. alditol c. enediol d. acetal e. ketalWhat is the common feature between an aldo- hexose and a ketohexose: A The number of secondary alcohol functions B The number of carbonyl groups C The number of asymmetric carbons D The number of primary alcohol functions E The nature of their carbonyl groupAnswer the following questions: a. How many possible stereoisomers does D-ribose have? b. What bond is present between the fatty acyl group and the C-2 amino group of sphingosine in a Ceramide?
- In the monosaccharide derivatives known as sugar alcohols, the carbonyl oxygen is reduced to a hydroxyl group. For example, D-glyceraldehyde can be reduced to glycerol. However, this sugar alcohol is no longer designated D or L. Why?Page 3 of 6 Previous Next For items 16-20, determine the monosaccharide units for each carbohydrate. Choic are: A. B-D-galactopyranose, and D-glucopyranose B. a-D-glucopyranose and D-glucopyranose C. N-acetyl-galactosamine D. B-D-glucuronate-2-sulfate, E. N-acetyl-B-D-glucosamine, and D-glucuronate 16. Maltose 17. Lactose and N-sulfo-D-glucosamine-6-sulfate 18. A-antigen oligosaccharide (end unit) 19. Heparin 20. Hyaluronic acid 344Classify each of the following sugar pairs as enantiomers, diastereomers, epimers, or an aldose–ketose pair. a. D-erythrose and D-threose b. D-glucose and D-mannose c. D-ribose and L-ribose d. D-allose and D-galactose e. D-glyceraldehyde and dihydroxyacetone
- Indicate whether the following pairs of monosaccharides are aldoses or ketoses. a. D-altrose & D-xylose b. D-arabinose & D-glyceraldehyde c. D-erythrulose & D-psicose d. D-talose & D-gulose e. dihydroxyacetone & D-tagatose f. D-idose & D-threoseThe sugar alcohol often used in “sugarless” gums and candies is Lsorbitol. Much of this alcohol is prepared by reduction of Dglucose. Compare these two structures and explain how this can beD Clositol L Sorbitol Why does it have two names?
- Sorbital sugar has two namesDescribe how carbohydrates can be classified into functional group of aldoses andketoses and give one example of each group (name and structure).Answers 557 ldentify the Fischer projection A to D that matches each of the following: (15.1, 15.3) a the L enantiomer of mannose h a ketopentose C. an aldopentose d. a ketohexose CH,OH H. H HO- CH,OH C=0 H HO- H. OH C=0 H OH HO H. HO H. HO H. H--OH HO H- H OH HO CH;OH CH,OH CH,OH CH,OH C D