Question

1- Sucrose does not react with Fehling's reagent because A- Sucrose is not a reducing sugar. B) The anomeric carbon of glucose is involved in the glucose- fructose bond and hence is not free to form the aldehyde in solution. C) The monosaacharide constituents of sucrose no longer have an anomeric carbon with a free potential aldehyde or ketone group, and therefore no longer exhibits reducing properties. D) sucrose is a disaccharide of glucose and fructose in which the oxygen on the anomeric carbon of one monosaccharide sugar is attached to an other monosaccharide. E) of all of the above

2. Animals cannot metabolize cellulose for which of the following reasons? A.. Cellulose is insoluble. B. They do not commonly consume cellulose. C. They do not have an enzyme to hydrolyze the beta-1,4-glycosidic bonds (linkages). D. They do not have an enzyme to hydrolyze the branches

3.The pyrimidine synthetic pathway differs from the purine biosynthetic pathway in that: A. An early reaction is feedback inhibited by nucleotides in purine synthesis but not in pyrimidine synthesis B. PRPP is the ribose donor for only purine synthesis C. The purine bases, but not the pyrimidine bases, use aspartate to furnish a ring nitrogen atom D. All the intermediates in the purine pathway are ribose phosphate derivatives E. Folic acid coenzymes function only in pyrimidine biosynthesis

4. A substrate used for ammonia production in the kidney that is also used for purine synthesis is: A. 5-Phosphoribosylamine B. Glycine C. Uric acid D. Aspartic acid E. Glutamine 5.Which of the following nucleotides contains a pyrimidine base? A.adenosine triphosphate B. guanosine triphosphate C. cytidine triphosphate D. both a and b E. none of the above