Question

2. Which of the following statements is true of cyclic forms of 6-carbon sugars? a. Conversion of the linear form to the cyclic form results from a reaction between the 0 3 carbonyl C and an alcohol in the same molecule. b. Six-C sugars only form 6-membered rings c. The cyclic form has the same number of chiral centers as the linear form. d.xAt room temperature in aqueous solutions, glucose is primarily in the linear form Both a and b are true. Both c and d are true. All of the above statements are true. None of the above statements is true. 3 Which of the following statements is true of glycosidic bonds? Glycosidic bonds form between any carbon atoms of two monosaccharides. If an anomeric C is part of a glycosidic bond, it readily reduces Cu to Cu N-glycosidic bonds are only found in synthetic compounds and are unimportant in systems. 0 0 d. 1-6 glycosidic bonds result in branching of amylopectin and glycogen. . All of the above statements are true. f. None of the above statements is true. 3

Answer 1

Ans 2 : a) Conversion of the linear form to the cyclic form results from a reaction between the carbonyl C and an alcohol in the same molecule.

The glucose exists in its cyclic form usually in pyranose state. The open chain form is present in very little amounts. The molecule can form both 5 membered and 6 membered rings.