Biochem Module 4 Exam Question and Answers 2023

which of the following monosaccharides is not an aldose? a. erythrose b. dihydroxyacetone c. glucose d. glyceraldehyde e. ribose Ans- b. dihydroxyacetone when two monosaccharides are epimers: a. they differ only ...

which of the following monosaccharides is not an aldose? a. erythrose b. dihydroxyacetone c. glucose d. glyceraldehyde e. ribose Ans- b. dihydroxyacetone when two monosaccharides are epimers: a. they differ only in the configuration about the penultimate carbon b. one is an aldose, the other a ketose c. they differ only in the configuration about one carbon atom d. they form o-glycosidic bonds e. they are oligosaccharides Ans- c. they differ only in the configuration about one carbon atom which pair is anomeric? a. D-glucose and D-fructose b. D-glucose and L-fructose c. D-glucose and L-glucose d. alpha-D-glucose and beta-D-fructose e. alpha-D-glucose and beta-D-glucose Ans- e. alpha-D-glucose and beta-D-glucose lactose is made from linking galactose and glucose. when this happens: a. a polysaccharide is formed b. gas is eliminated c. an epimer is formed d. an anomeric carbon is formed on carbon-1 e. lactose forms by a condensation reaction Ans- e. lactose forms by a condensation reaction lactose is made from linking galactose and glucose. when this happens: a. gas is eliminated b. an anomeric carbon is formed on carbon-1 c. water is released d. an epimer is formed e. an aldose is formed Ans- c. water is released chitin and cellulose are both polymers of: a. alpha-D-glucose b. galactose c. beta-D-glucose d. idose e. maltose Ans- c. beta-D-glucose *starch, glycogen, amylose, and amylopectin = alpha-D-glucose amylose and amylopectin are both polymers of: a. alpha-D-glucose b. beta-D-glucose c. galactose d. idose e. maltose Ans- a. alpha-D-glucose *cellulose and chitin = beta-D-glucose *starch, glycogen, amylose, and amylopectin = alpha-D-glucose which statement about starch and glycogen is false? a. amylose is unbranched; amylopectin and glycogen contain many branches b. both are heteropolymers of glucose c. both have many -OH groups in their structures d. both starch and glycogen are energy storage polysaccharides e. glycogen is more extensively branched than starch Ans- b. both are heteropolymers of glucose which statement about starch and glycogen is false? a. both have beta-D-glucose monomers b. both starch and glycogen are energy storage polysaccharides c. both are homopolymers of glucose d. glycogen is more extensively branched that starch e. both have O-glycosidic linkages Ans- a. both have beta-D-glucose monomers *starch and glycogen have alpha-D-glucose monomers which monosaccharide is not a 6-carbon monosaccharide? a. idose b. glucose c. galactose d. dihydroxyacetone e. allose Ans- d. dihydroxyacetone which monosaccharide is not a 6-carbon monosaccharide? a. fructose b. ribose c. mannose d. galactose e. glucose Ans- b. ribose what are the 2 monosaccharides shown below? Ans- aldose (1 C2OH group) ketose (2 C3OH groups) the 2 monosaccharides shown below could be best described as: a. anomers b. aldoses c. ketoses d. epimers e. pentoses Ans- d. epimers *epimers = D/l anomers = alpha/beta what is an anomeric carbon? Ans- the new chiral center formed in ring closure; it was the carbon containing the carbonyl in the straight-chain form attached to an -OR group, -OH group, C, and H which arrow correctly identifies the atom that will become the anomeric carbon? Ans- carbon-1, which is at the top of the Fischer structure based on the form of the cyclic sugar below in a Haworth projection, which Fischer projection formula could have formed this structure? Ans- *look at the Haworth projection and create Fischer projections for it the following monosaccharides are covalently bonded. what type of bond unites them? Ans- alpha 1-->6 which statement about cellulose is true? a. cellulose is found in plants b. cellulose in the primary storage polysaccharide of animal cells c. cellulose is found in DNA d. the glucose residues of cellulose contain the same configuration as the glucose residues of amylose e. cellulose is an epimer of chitin Ans- a. cellulose is found in plants which statement about cellulose is true? a. cellulose is the primary storage polysaccharide of animal cells b. cellulose is a highly branched polysaccharide c. cellulose is a homopolysaccharide d. the glucose residues of cellulose contain the same configuration as the glucose residues of amylose e. cellulose is an anomer of chitin Ans- c. cellulose is a homopolysaccharide the polysaccharide cellulose is most chemically similar to: a. glycogen b. dextrose c. glucose d. chitin e. starch Ans- d. chitin which of the following is the most common monosaccharide on earth? a. ribose b. cellulose c. chitin d. sucrose e. glucose Ans- e. glucose the "D" in D-carbohydrates stands for: