Which of the following monosaccharides is not an aldose? A) crythrose B) fructos

Question

Which of the following monosaccharides is not an aldose? A) crythrose B) fructose C) glucose D) glyceraldehyde E) iribose 2. When two carbohydrates are epimers: A) one is a pyranose, the other a furanose. B) one is an aldose, the other a ketose. C) they differ in length by one carbon. D) they differ only in the configuration around one carbon atom. E) they rotate plane-polarized light in the same direction. 3. Which of the following is an epimeric pair? A) D-glucose and D-glucosamine B) D-glucose and D-mannose c) D-glucose and L-glucose D) D-lactose and D-sucrose E) L-mannose and L-fructose 4. Which of the following is not a reducing sugar? A) Fructose B) Glucose C) Glyceraldehyde D) Ribose E) Sucrose 5. D-Glucose is called a reducing sugar because it undergoes an oxidation-reduction reaction at the anomeric carbon. One of the products of this reaction is: A) D-galactose. B) D-gluconate. C) D-glucuronate. D) D-ribose. E) muramic acid.

Explanation / Answer

1. B. fructose

Fructose is ketose

2.D they are differ only in the configuration around one carbon atom.

alpha-glucose and beta -glucose are epimers

3.C. D- glucose and L- glucose

4. E. sucrose

sucrose in non reducing suger.

5. B gluconate

6. Alpha -D- glucose

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