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- What are reducing sugars? Why is sucrose non-reducing while lactose also a dissacharide, is reducing?An amylose chain is 5000 glucose units long. At how many places must it be cleaved to reduce the average length to 2500 units? To 1000 units? To 200 units? What percentage of the glycosidic links are hydrolyzed in each case? (Even partial hydrolysis can drastically alter the physical properties of polysaccharides and thus affect their structural role in )Raffinose, the most abundant trisaccharide found in nature, occurs in whole grains and numerous vegetables (e.g., asparagus, cabbage, and beans). Hydrolysis of raffinose yields galactose and sucrose. Provide the systematic name for this trisaccharide. Is raffinose a reducing or nonreducing sugar? Is raffinose capable of mutarotation?
- Gentiobiose (D-Glc(β1→6)D-Glc) is a disaccharide found in some plantglycosides. Draw the structure of gentiobiose based on its abbreviated name. Is it a reducing sugar? Does it undergo mutarotation?Which of the following is the correct systematic name of the disaccharide shown? α-D-glucopyranosyl-(1→3)-β-D-galactopyranose α-D-gulopyranosyl-(1→4)-β-D-glucopyranose α-D-gulopyranosyl-(1→4)-β-D-galactopyranose α-D-glucopyranosyl-(1→3)-β-D-glucopyranoseWhat are/Give the 4 structures of L-Cysteine from highly protonated to deprotonated form? What are the charges?
- The following structure is sorbose Answer the following questions and briefly explain Draw β-D-sorbufuranose Draw β-D-sorbufuranosyl(2->1) β-D-glucopyranoside. Is this reducing sugar? What would be the probable function of this disaccharide, structural or storage?An amylose chain is 5000 glucose units long. At how many places must it be cleaved to reduce the average length to 2500 units? To 1000 units? To 200 units? What percentage of the glycosidic links are hydrolyzed in each case? (Even partial hydrolysis can drastically alter the physical properties of polysaccharides and thus affect their structural role in organisms.)Why is sucrose a non-reducing sugar with Benedict’s solution while lactose is a reducing sugar under the same condition?
- Trehalose, also known as mycose, is a disaccharide found in certain mushrooms. It is composed of two a-D-glucose linked in a aa(1à1) glycosidic bond. Using Haworth projection, draw the structure of trehalose. Indicate whether it is reducing or non-reducing.Draw both possible disaccharides of D-psicose and D-mannose that are joined by an α(1→4) glycosidic linkage. Are either of them now a reducing sugar?Considering the formation of glycosidic linkages between monosaccharides, how many possible trisaccharides can be produced by combining glucose, mannose and galactose? How does this differ from the number of possibilities for a tripeptide composed of three different amino acids?