Biochemistry: Concepts and Connections (2nd Edition)
2nd Edition
ISBN: 9780134641621
Author: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
Publisher: PEARSON
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Chapter 9, Problem 6P
A reducing sugar will undergo the Fehling reaction, which requires a (potential) free
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A reducing sugar will undergo the Fehling reaction, which requires a(potential) free aldehyde group. Which of the disaccharides shown inFigure are reducing and which are nonreducing?
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?
Indicate whether each of the following monosaccharides would be classified as an aldose, ketose, triose, tetrose, pentose, or hexose (each can be classified into two different categories). Which of these sugars would exist predominantly in the cyclic form?
Chapter 9 Solutions
Biochemistry: Concepts and Connections (2nd Edition)
Ch. 9 - Prob. 1PCh. 9 - -D-Galactopyranose rotates the plane of polarized...Ch. 9 - Provide an explanation for the fact that a-...Ch. 9 - Why is a type O individual considered a universal...Ch. 9 - The disaccharide , -trehalose differs from the ,...Ch. 9 - A reducing sugar will undergo the Fehling...Ch. 9 - Prob. 7PCh. 9 - Prob. 8PCh. 9 - Indicate whether the structures shown are R and S...Ch. 9 - Prob. 10P
Ch. 9 - Draw (using Haworth projections) the fragments of...Ch. 9 - One or more of the compounds shown below will...Ch. 9 - Why do you suppose that the influenza virus...Ch. 9 - Prob. 14PCh. 9 - Are mannose and galactose epimers? Allose and...Ch. 9 - Prob. 16PCh. 9 - Explain in about one sentence why it is important...Ch. 9 - Prob. 18PCh. 9 - Prob. 19PCh. 9 - Prob. 20PCh. 9 - Prob. 21PCh. 9 - Prob. 22PCh. 9 - Prob. 23P
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- Can you please identify the name of each of the structures of sugar and identify as reducing or nonreducing sugar of a,b,c and d? The picture is posted. One of the structures may be not identified from the usual structures of disaccharides.arrow_forwardFor a sugar to behave as a reducing sugar, it must have a free aldehyde group. Fructose is a ketose, yet it behaves like a reducing sugar. Explain.arrow_forwardAlthough the first two carbons of fructose and glucose are identical in structure to DHAP and GADP (from glycolysis), DHAP and GADP equilibriate on their in solution to favor the ketone over the aldehyde, while fructose and glucose do not. Why? a)The larger size of the molecule sterically hinders the isomerization b)The larger sugars have more OH groups which hydrogen bond and disrupt isomerization c)The larger sugars cyclize, and there is no carbonyl to isomerize in the cyclic form d)The larger sugars cyclize, and in the cyclic form the hydrogen bonding is very strong e)The larger sugars are less soluble in water than the smaller sugarsarrow_forward
- Naturally occurring D-glucose is one of a pair of enantiomers. Its mirror image is L-glucose. Draw the two cyclic six-membered isomers of L-glucose that differ in the configuration around C1 and indicate which is a and which is B.arrow_forwardConsider the following statements: (1) The term sugar is a general designation for both monosaccharides and disaccharides. (2) The "penultimate carbon" in a monosaccharide is used to determine D- or L-configuration. (3) Sucrose is a reducing sugar and lactose is a nonreducing sugar. O Two of the three statements are true. All three statements are true. O Only one of the statements is true. None of the statements are true.arrow_forward1) Please list all glycosidic linkages between each monosaccharide units. For example, α(1→4)2) Please discuss whether these oligo/polysaccharides would be reducing or non-reducing sugar. Remember to state your reasoning in complete sentence.arrow_forward
- Given the structures of the saccharides below, encircle and name the glycosidic bonds present. Indicate the orientation (α or β) of each monosaccharide units in the given figures.arrow_forwarddraw disaccharide as Haworth projection: (shown in image) -is this drawing a reducing sugar? Briefly explainarrow_forwardA disaccharide that is found in dairy products can be formed by the two monosaccharides. Please draw the Haworth structure of this disaccharide and give the name of the glycosidic bond.arrow_forward
- Following are Fischer projections for a group of five-carbon sugars, all of which are aldopentoses. Identify the pairs that are enantiomers and the pairs that are epimers СНО СНО СНО H-C-OH H-C-OH H-C-OH H-C-OH Но-С—н H-C-OH H-C-OH Но-ҫ—н Но—с—н CHOH CHĻOH ČH,OH СНО СНО СНО Но —С— н H-C-OH HO-C-H Н—С—он Но -С—н HO-C-H H-c-OH H-C-OH HO-C-H CH̟OH ČHĻOH ČHĻOH Pairs of Enantiomers Pairs of Epimersarrow_forwardThe 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?arrow_forwardDefine the term reducing sugar. What structural feature doesa reducing sugar have?arrow_forward
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