1. You are given the following carbohydrates: glucose, maltose, sucrose, and starch. Explain the results described below. (a) A carbohydrate solution gave a negative Benedict's, Barfoed's, Bial's, and a positive Seliwanoff's tests. When treated with hydrochloric acid and boiled for several minutes, the solution showed positive Benedict's, Barfoed's, and Seliwanoff's tests and a negative Bial's test. What carbohydrate was in the original solution? (b) A solution containing only one carbohydrate gave a Cu2O precipitate with Benedict's reagent. Which possible carbohydrates are present in the solution? (c) Another sample of the solution from (b) failed to give a Cu2O precipitate with Barfoed's reagent within 5 min. Which carbohydrate is present in the solution?

1. You are given the following carbohydrates: glucose, maltose, sucrose, and starch. Explain the results described below. (a) A carbohydrate solution gave a negative Benedict's, Barfoed's, Bial's, and a positive Seliwanoff's tests. When treated with hydrochloric acid and boiled for several minutes, the solution showed positive Benedict's, Barfoed's, and Seliwanoff's tests and a negative Bial's test. What carbohydrate was in the original solution? (b) A solution containing only one carbohydrate gave a Cu2O precipitate with Benedict's reagent. Which possible carbohydrates are present in the solution? (c) Another sample of the solution from (b) failed to give a Cu2O precipitate with Barfoed's reagent within 5 min. Which carbohydrate is present in the solution?

Curren'S Math For Meds: Dosages & Sol

11th Edition

ISBN:9781305143531

Author:CURREN

Publisher:CURREN

Chapter21: Heparin Infusion Calculations

Section: Chapter Questions

Problem 1.3P

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A. You are given the following carbohydrates: glucose, maltose, sucrose, and starch. Explain the results described below. a. A carbohydrate solution gave a negative result in the Benedict's and Barfoed's tests. When treated with hydrochloric acid and boiled for several minutes, the solution showed a positive result. Explain. b. A solution containing only one carbohydrate gave a Cu2O precipitate with Benedict's reagent. Which possible carbohydrates are present in the solution? c. Another sample of the solution from (b) failed to give a Cu2O precipitate with Barfoed's reagent within 5 min. Which carbohydrate is present in the solution?[
Which of the following statements best describe testing of lactose sample?* A. Lactose will quickly (less than 3 minutes) form a thin brick red precipitate in a Barfoed's test since it is a reducing monosaccharide. B. Lactose will give positive test using phenylhydrazine test and forms a needle shaped osazone C. Lactose when reacted with nitric acid and exposing to cold water bath will form insoluble white crystals. D. Lactose when tested using Seliwanoff's test will form a red colored complex.
Describe how a solution of lactose would react toward these reagents. a. Benedict's b. Barfoed's
Based on this video https://www.youtube.com/watch?v=rKng5-ij6kQ Provide a schematic diagram for the Molish ’s test methodologies in determining the presence of carbohydrates. Also, give the basic principle for the test.
3 (Note: Need site of reference)
Based on this video https://www.youtube.com/watch?v=rKng5-ij6kQ Provide a schematic diagram for the Benedict's test methodologies in determining the presence of carbohydrates. Also, give the basic principle for the test.
i would like to ask the following questions since it was not elaborated during discussion. In Molisch Test: 1. Why are the results appearing faster in monosaccharides than disaccharides and polysaccharides?2. Why is it negative for tetrose and triose even if they are carbohydrates? In Bial’s Test3. Why does pentose result to blue while hexose result in other color?
Choose the correct description for the Biomolecule Test demonstrated in the figure. reagent త The polysaccharide starch is tested using Lugol's lodine The protein is tested using Biuret Reagent. The protein is tested using Lugol's lodine The polysaccharide starch is tested using Biuret Reagent O O O
An unknown solution contains a single pure sugar. It gives positive results to Molisch’s and Benedict’s tests but is negative for all others. What is the sugar? Is it sucrose, lactose, or xylose? Explain your choice.
Laemmli buffer, also referred to as SDS-reducing buffer, is added to each of the samples. It is a blue solution and the recipe for 2X Laemmli buffer is: 0.125 M Tris HCl, pH 6.8, 20% glycerol, 4% SDS and 10% β-mercaptoethanol (βME). What is the purpose of each of these ingredients?
1. Which of the following statements best explains the positive result of the acid hydrolysate of sucrose for benedict's test?* The acid hydrolysate of sucrose contains glucose only The acid hydrolysate of sucrose contains fructose only Both glucose and fructose are present in the acid hydrolysate of sucrose Neither glucose nor fructose is present in the acid hydrolysate of sucrose 2. Which of the following intermolecular molecular forces of attraction is disrupted when a native protein is added with acetic acid?* Hydrogen bond Peptide bond Disulfide bond Salt bridge van der Waals force
Based on this video https://www.youtube.com/watch?v=rKng5-ij6kQ Provide a schematic diagram for the Seliwanoff’s test methodologies in determining the presence of carbohydrates. Also, give the basic principle for the test.