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- Which of an alpha-D-2,3-di-O-methylglucopyranose or alpha-D-2,3, 6-tri-O-methylglucopyranose represents a glucose unit in glycogen which was originally carrying an (alpha 1-->6) glycosidic bond?When a certain trisaccharide is completely methylated (i.e. all of the free OH groups have been converted to OCH3 groups) and then hydrolyzed (i.e. all of the glycosidic linkages have been broken) equal molar amounts of 2,3,4,6-tetra-O-methyl-D-galactose, 2,3,4-tri-O-methyl-D- mannose, and 1,2,4,6-tetra-O-methyl-D-glucose are obtained. When this same trisaccaride is treated with beta-galactosidase ( an enzyme that hydrolyzes the indicated glycosidic bond indicted by it's name) it yields D- galactose and a disaccharide. Treatment of the resulting disaccharride with alpha- mannosidase yields D-mannose and D-glucose. Draw the structure of the beta anomer of the original trisaccharide.Modify the structures of D-glucose and D-mannose to show a-D-glucosyl-(1→6)-D-mannosamine. H с H2C ОН с Н ОН Ni/ с ОН Н C I ОН Н 0 Н с CH₂ ОН Н ОН NM! с ジミ Н NH₂ ОН C | Н C
- Identify the structure of O-a-D-sorbopyranosyl-(24)-B-D-glucopyranose below. The following structures will help: НО Н ОН х Н H H D-sorbose Н OH CH₂OH Н Н Н OH HO Н H HO H н HO ОН Н н Н О ОН O H Н CH₂OH OH OH н 0 CH2OH Н OH Н H OH Н CH₂OH H ОН Н OH Н Н Н РО OH Н HO OH н н -O CH2O Н O H H OH н Н OH CH₂OH о CHOH H H Н Ко OH H OH Н Н OH Н OH Н OH Н CH₂OH -OCHOH H OH O CH OH Н OH Н Н CH₂OH ОН он OH OH H OH H O OH CH₂OH OH ОН Н O OH OH D-glucose Н ОН Н ОН ОНWhich of the following is the correct systematic name of the disaccharide shown? OH он но но но- OH Он a-D-glucopyranosyl-(1-3)-B-D-galactopyranose O a-D-glucopyranosyl-(1–3)-B-D-glucopyranose O a-D-gulopyranosyl-(1-4)-B-D-glucopyranose O a-D-gulopyranosyl-(1-4)-B-D-galactopyranoseName which, if any, of the following are epimers of d-glucose: Dmannose, D-galactose, D-ribose.
- Trace the pathway of [14C]bicarbonate through gluconeogenesis. Use an asterisk to indicate the location of ¹4C in all intermediates and in the final gluconeogenesis product, glucose. HO-C O- =0 [¹C] Bicarbonate CH₂OPO H-C-OH --OPO O 1,3-Bisphospho- glycerate ↑ -COO -CH₂ TC=O coo Oxaloacetate CH,OPO H-C-OH COO ↑ 3-Phosphoglycerate CH₂ C-OPO -COO Phosphoenolpyruvate CH,OH HC-OPO, COO 2-Phosphoglycerate Answer BankWhat sugar units make up the structure shown? ÇH,OSO;- но Po- H H. ÇOO- NHCCH, H OH H H OH O D-Glucuronate and N-Acetyl-D-galactosamine-6-sulfate O D-Glucuronate and N-Sulfo-D-glucosamine-6-sulfate O D-Iduronate and N-Acetyl-D-galactosamine-6-sulfate O D-Glucuronate and N-Acetyl-D-glucosamine-6-sulfateWhich of the structures below is that of о-в-D-glucopyranosyl-(1->4)- a-D-glucoругanose CH2OH CH2OH H. OH он H Он OH OH CH2OH HOH2Ć OH он CH2OH CH2OH OH H он H он он CH2OH CH2 OH H OH он OH None of the other structures are correct.
- Name which, if any, of the following are epimers ofd-glucose: d-mannose, d-galactose, d-ribose1. Draw the condensed structural formulas for A and B. [0] [0] CH, CH, CH-CH, C-OH А B 2. Identify the type of glycosidic bond that links the monosaccharides and the structure of the disaccharide as a- or 8-isomer. CH-OH H. H OH H. CH, HO OH H. H. ОН Н OH HO H. OH A,Consider the Haworth projections of f-L-galactose and B-L-glucose shown here. ОН CH OH ОН ОН B-L-galactose enantiomers anomers OH diastereomers epimers ОН CH₂OH OH Which terms describe the relationship between these two sugars? ОН OH B-L-glucose