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- (g) Using appropriate prefixes/infixes/suffixes (ketohentese, aldahentase, etc.), classify each of the monosaccharides shown below. СНО CH2OH O: HOI но ОН OH HO H. CH2OH CH2OH I II (h) Identify B-D-altrose and oa-D-altrose from the monosaccharides shown below. CH2OH CH2OH CH2OH CH2OH O. ОН OH OH OH OH OH ОН OH OH OH ОН OH OH OH OH OH I II III IV | (i) Identify B-D-altrose and oa-D-altrose from the monosaccharides shown below. VI I CH2OH CH2OH II V OH III ОН IV H OH H4. Identify the component monosaccharides of each of the following compounds and describe the type of glycosidic linkage in each. Но он Но OH HO он Но- Но- (a) OH (c) CH,OHO. (b) CH2OHO Lon OH HO H ČHOH H OH ÓH ОНThe anticoagulant heparin is a polysaccharide that contains alternating residues of -D- glucuronic acid-6- sulfate and N-sulfo-D-glucosamine-6sulfate connected by (1 B 4)- glycosidic linkages. Draw a part of heparin that shows one each of the two residues.
- (h) Identify B-D-altrose and a-D-altrose from the monosaccharides shown below. VI I CH2OH O. CH2OH II H V ОН, IV H III OH OH H (i) The monosaccharide below is a(n) (d-aldopentose, R-aldopentose, S- aldopentose, L-aldopentose, D-aldopentose).Lactose is a disaccharide in which a glycosidic linkage connects the monosaccharides galactose and glucose. OH НО OH (a) Identify the glycosidic linkage and the acetal carbon in lactose. (b) What type of glycosidic linkage does lactose have (i.e., is it 1,1'-, 1,2'-, etc., and is it a or B)? (c) People who are lactose intolerant are deficient in the enzyme lactase, and therefore cannot efficiently break down the disaccharide into its monosaccharides. When lactose is treated with aqueous acid, however, this hydrolysis can take place, though relatively slowly. Draw the complete, detailed mechanism and the products of the acid-catalyzed hydrolysis of lactose. Но ОН НО ОН ОН Lactose(g) Using appropriate prefixes/infixes/suffixes (ketoheptose, aldoheptose, etc.), classify each of the monosaccharides shown below. CHO CH2OH Но IH но- HO- HO- HO H. CH2OH CH2OH I II (h) Identify B-D-altrose and a-D-altrose from the monosaccharides shown below. CH2OH CH2OH CH2OH CH2OH OH OH OH ОН OH ОН ОН OH OH OH OH OH OH OH OH OH I II II IV (i) Identify B-D-altrose and a-D-altrose from the monosaccharides shown below. VI I CH2OH O CH2OH II H V ОН, III IV OH OH H
- Arabinoxylan is a copolymer of arabinose and xylose-two five-carbon sugars. A portion of the polysaccharide is shown here. (a) Identify and classify each glycosidic linkage. (b) Based on the structure, do you think arabinoxylan functions as a storage polysaccharide or a structural polysaccharide? Explain your reasoning. HOH,C. OH Но OH OH но но OH Но LO. Но HOH,C HOH2C НО OH OH CH,OHWhich disaccharide contains an a(1-4) glycosidic bond? CH2OH CH,OH CH2OH CH2OH OH OH OH OH OH OH ÓH ÓHWhat glycosides are formed when each monosaccharide is treated with CH3CH2OH, HCl: (a) β-D-mannose; (b) α-D-gulose; (c) β-D-fructose?
- 3. Consider the two following monosaccharides. -HO- но О он H H H H H он H OH Но H OH OH OH Draw the disaccharide that forms between the two in which the glycosidic bond is an a (1→4) linkage. The monosaccharide on the left should be the "left-most" structure you draw. oints) (2inlo0.25slussiom giwolot losee (ajnodis lsida o alDraw the structure of: (a) a polysaccharide formed by joining D-mannose units in 1→4-β- glycosidic linkages; (b) a polysaccharide formed by joining D-glucose units in 1→6-α- glycosidic linkages. The polysaccharide in (b) is dextran, a component of dental plaque.Draw the structures (using chair conformations of pyranoses) of the following disaccharides.(a) 4-O-(a-d-glucopyranosyl)-d-galactopyranose(