2. The diagram below shows the structure of a sugar. ÇH2OH C=0 Но -H- но ČH2OH a. Is the sugar an aldose or ketose? b. Is the sugar at D or L configuration? Explain why. How many chiral carbons are present in the sugar? с.
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- A monosaccharide designated as an aldehyde sugar contains (a) a terminal carboxyl group (b) an internal carboxyl group (c) a terminal carbonyl group (d) an internal carbonyl group (e) a terminal carboxyl group and an internal carbonyl group1. (a) The diagram below shows a structure of monosaccharide. CH,OH C=0 H-C-OH НО—С—Н ČH,OH i. Draw the figure above on your answer sheet and indicate ALL chiral carbon(s) in your figure with *. ii. With reference to the number of carbon, the type of carbonyl group and D/L configuration, suggest a name consisting these three properties to describe the monosaccharide shown above. Explain why this monosaccharide is in D- or L- configuration as you suggested in (ii). 111. (b) The diagram below shows different configurations of glucose. CH,OH CHO ÇH,OH H H-C-OH O. OH H. H. OH H. H OH HO-C-H но H-C-OH но H. H-C-OH OH OH ČH,OH A В C i. Which glucose molecule, A or C, is in a configuration? Explain. ii. What is the name of the conversion among different configurations? iii. Glycosaminoglycans (GAG) consist of modified sugars. Give a name of the typical modification to the sugar. What makes GAG ideal for the fluid in the joints? to1. a. Draw D-glucose and D-fructose as a linear sugar chain. b. Label the carbons with their appropriate number. c. Label the carbonyl group. d. How do you know these are the D stereoisomers? e. Are these ketoses or aldoses? f. How many chiral centers does each molecule have? g. How many possible stereoisomers could D-glucose have, including itself? h. Where are they? i. Upon cyclization would these molecules by pyranoses or furanoses? 2. Convert this Fischer projection to a Haworth perspective of the cyclic molecule with an alpha configuration at the linkage. What is this molecule? HO H HO H H OH H- OH CH₂OH 3. Compare and contrast the structural characteristics of starch vs. glycogen. What is the functional role of branching in these polysaccharides?
- 30. The shown structure is a cyclic D-monosaccharide. Which of the following statements is true? HOCH₂ H OH H OH OH CH₂OH A. The chemical can react with methanol to form a hemiacetal in solution without forming an open chain structure B. The chemical needs to form an open chain structure to be able to react with methanol to produce a glycosidic linkage in solution C. Both A and B D. Neither A nor B13. The following diagram shows two possible cyclic forms of glucose. H. OH но HOHO HO но но OH ОН OH Structure A alpha-D-glucopyranose In the form on the left, the systematic name of glucose is alpha-D-glucopyranose What is the systematic name of Structure A?Which of the following is/are reducing sugar/s?why? A CHOH CHOH CHOH OH OH CHOH OH CH,OH OH OH он C CHOH OH CHOH CHOH HỌ CH2OH OH OH OH OH ÓH u tte Select one: O a. Conly, it is a monosaccharide with a free carbonyl group O b. A and B only, both disaccharides are made from aldoses O C. B, C and D, they have at least one free carbonyl group O d. A and D only, both disaccharides are made from ketosis O. e. B and D, each has a free carboxyl group
- a. Identify the disaccharide in the photo. b. the glycosidic linkage in this disaccharide is what? α (1-2) linkage β (1-4) linkage α (1-4) linkage β (1-2) linkage c.Is the disaccharide below a non-reducing sugar?Part d pls2. Name the disaccharide (shown at right) formed by glycosidic linkage of D-Glucose and D-Fructose. ● Name this disaccharide: Do you expect this disaccharide to be a reducing sugar? Briefly explain. OH HOCH₂ H CH₂OH I H OH H H HO OH H H O OH H CH₂OH
- A. What are F and E? (circle the correct answer): a. Enantiomers b. Diastereoisomers c. Epimers d. Constitutional isomer B. Indicate which ones are pentoses in the figure C. Indicate which one is(are) ketose(s) in the figurea. Is the disaccharide below a non-reducing sugar? yes or no b. The glycosidic linkage in the disaccharide is what β-(1-2) linkage, α-(1-2) linkage, β-(1-4) linkage, or α-(1-4) linkage? c. The products of hydrolysis of the disaccharide (which of the ff.) α-galactose and α-ribose α-glucose and α-fructose α-fructose and α-galactose α-glucose and α-galactose1. The diagram below shows the chemical structure of two sugar molecules. СНО b. CHZOH а. HO C=0 НО—Н H -H- Но- НО —Н CH2ОН CH;OH How many chiral carbons are in sugars a and b? b. Are they D- or L- sugars? Explain your answer. What is the name of this kind of representation of the sugars in the diagram? а. с. d. If these two sugars form a cyclic structure using the hydroxyl group on the last carbon, will they form furanose or pyranose? Also, on each sugar on the Answer Sheet, circle the carbon which will become the anomeric carbon in the cyclic structure.