What is a reducing sugar? What is the significance of the reducing ability of a sugar?...
PLEASE HELP ME WITH THE REDUCING SUGAR and the question at the end!!!! Hydrolysis of Macromolecules Experiment (dry lab) Benedict’s Test for reducing sugars (with heat) TUBE SUBSTANCE TESTED FINAL COLOR TEST RESULTS (+ or -) IF POSITIVE, name the reducing sugar A Starch *without* saliva Clear blue - B Starch *with* saliva Thick yellow + Question What happened to the macromolecule when saliva was added to the test tube?
QUESTIONS: 1. When a reducing sugar reacts with Benedict reagent, what organic product is formed besides Cu20? Why is the formation of Cu O significant in this test? 2. What chemical test is performed to indicate the completion of the hydrolysis of starch by acid?
CH,OH b. Is the ketopentose a reducing sugar? c. Is the ketopentose a deoxy sugar? d. Is the ketopentose an amino sugar? e. Draw the L-2-ketopentose that also gives the alcohol sugar above, when treated with H, and Pt. 10.59 a. 10.60 a 10.47 Draw the alcohol sugar, aldonic acid, and uronic acid that can be formed from each monosaccharide. a. D-2-deoxyribose b. L-2-deoxyribose C. the C-3 epimer of D-2-deoxyribose 10.61 10.62 10.48 Draw the alcohol sugar, aldonic acid, and...
3. Indicate whether each of the following disaccharides is a reducing or nonreducing sugar by the criterion of reaction with Fehling's solution. (4 pts.) (a) Glca(1+2) Fruß (b) GalB (174) Gieß
these both questions please explain. Identify the incorrect statement regarding the reducing sugar test 1) The reducing sugar test is an oxidation reduction reaction involving the carbonyl carbon of a sugar and an oxidant such as Cu2+ O 2) Reducing sugars will reduce Cu2+ to Cut leading to the production of a reddish brown precipitate. 3) If the anomeric carbon of a sugar is associated in a glycosidic bond, that sugar will no longer act as a reducing sugar 4)...
15 points) You are given a carbohydrate to analyze. It behaves as a reducing sugar with a Tollen's test. When you exhaustively methylate it with alkaline CH3l and then hydrolyze with strong acid, you get the following in an equal molar ratio (1:1); 2,3,4,6-tetra-o-methylgalactose 2,3,6-tri-O-methylglucose You try reacting it with different glycosidases, and get the following results: a-galactosidase: No reaction B-galactosidase: produces galactose and glucose (1:1) as products a-glucosidase: No reaction B-glucosidase: No reaction . (2 point) Based upon these...
Problems and questions 1. Is the following disaccharide a reducing sugar? Explain. сн-Oн OH OH OH о CH2OH ОН OH Он 2. The following test results were observed in a lab experiment: A reddish-orange solid with the Benedict' test A reddish precipitate with the Barfoed's test A red color within 1 minute with the Seliwanoff's test A yellow color with the iodine test Name the carbohydrate that you would expect to show these results. [Reminder: there is one more problem...
5) What is meant by the term"reducing sugar"? 6) Draw out structures to show the hydrolysis of the following carbohydrates: a) Sucrose b) Lactose c) Starch ( show 4 repeating units)
Culhydrates 1. Complete th Complete the table by classifying each sugar sugar (A, B, C, D) below based on carbonyl group and number of carbons (c.8. aldohexose, ketotriose, etc.). Classify them as an antiomer. Indicate the number of chiral carbons for each sugar. Sugar Classification based on carbonyl group and number of carbons Lor D enantiomer Number of chiral carbons н-с-он HO-6-H. н-с-он ін,он CH,OH C=0 HO-C-H н-с-он HO-C-H. ён,он снон c=0 | HO-C-H ін,он H-C-OH CH, OH CD 2....
• Is the following disaccharide a reducing sugar? Explain. CH OH OHO ОН СН,ОН OH OH ОН 2. The following test results were observed in a lab experiment: • A reddish-orange solid with the Benedict test • A reddish precipitate with the Barfoed's test • A red color within 1 minute with the Seliwanoffs test • A yellow color with the iodine test Name the carbohydrate that you would expect to show these results.