seawater Bromine i gbtheoxidaionofb Addition to n fatt tyrosine,a phenol) 9 Oxidation of aldoses to aldonic acids(e.g,CHO to CO2H) a-bromination of fatty acids(e.g.,RCH2CO2H-?RCHBrCO2H) E) None of these reactions could occur in living systems Ans:D Wfthe reactions nstw would be catalyzed 5 a glycosidase enzyme? 6-phosphate ruto6-phosphate sucrose invert sugar C) cellulose glucose 9 amylose glucose E)glucose 6-phosphate- glucose phosphate ion Ans:B 6.What would be the name of the following sugar structure? ho HO OH OH a-D-galactopyranose D)a-D-glucopyranose B-D-glucopyranose E)B-D-galactofuranose C) B-D-galactopyranose Ans:B 7.What would be the name of the following sugar? CHO H HO- -H HO CH2OH D-glucose B)L-glucose C)L-galactose D)L-mannose E) Ans: Page 5 Page 5 4. Bromine is a dense, deep red-brown liquid obtained by the oxidation of bromide ion in seawater. Bromine is very toxic. Which of the following reactions of bromine with organic materials would be least likely in a biological system (would not occur)? A) Addition to non-aromatic carbon-carbon double bonds (e.g., in fatty acids) B) Electrophillic aromatic substitution of very activated aromatic rings (e.g., in tyrosine, a phenol) C) Oxidation of aldoses to aldonic acids (e.g., CHO to CO2H) D) α-bromination of fatty acids (e.g., RCH2CO2H →?RCHBrCO2H) E) None of these reactions could occur in living systems Ans: D 5. Which of the reactions listed below would be catalyzed by a glycosidase enzyme? A) glucose 6-phosphate fructose 6-phosphate B) sucrose invert sugar C) cellulose glucose D) amylose glucose E) glucose 6-phosphate glucose + phosphate ion Ans: B 6. What would be the name of the following sugar structure? O OH OH HO HO HOH2C A) α-D-galactopyranose D) α-D-glucopyranose B) β-D-glucopyranose E) β-D-galactofuranose C) β-D-galactopyranose Ans: B 7. What would be the name of the following sugar? CHO HO H H OH HO H HO H CH2OH A) D-glucose B) L-glucose C) L-galactose D) L-mannose E) D-mannose Ans: B