Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Carbohydrates


21. To possess optical activity, a compound must be
a) a carbohydrate.
b) a hexose.
c) asymmetric.
d) D-glucose.

22. Which of the following monosaccharides is not an aldose?
a) erythrose
b) fructose
c) glucose
d) ribose

23. The reference compound for naming D and L isomers of sugars is:
a) fructose.
b) glucose.
c) glyceraldehyde.
d) ribose.
e) sucrose.

24. 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.

25. Which of the following is an epimeric pair?
Epimers- D-mannose and D-glucose
a) D-glucose and D-glucosamine
b) D-glucose and D-mannose 
c) D-lactose and D-sucrose
d) L-mannose and L-fructose

26. Which of following is an anomeric pair?
a) D-glucose and D-fructose
b) D-glucose and L-fructose
c) D-glucose and L-glucose
d) a-D-glucose and b-D-glucose

27. When the linear form of glucose cyclizes, the product is a(n):
a) anhydride.
b) glycoside.
c) hemiacetal.
d) lactone.

28. Which of the following pairs is interconverted in the process of mutarotation?
a) D-glucose and D-fructose
b) D-glucose and D-galactose
c) D-glucose and D-glucosamine
d) a-D-glucose and b-D-glucose

29. Which of the following is not a reducing sugar?
a) Fructose
b) Glucose
c) Glyceraldehyde
d) Sucrose

30. Which of the following monosaccharides is not a carboxylic acid?
a) 6-phospho-gluconate
b) gluconate
c) glucose
d) glucuronate

31. 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.


32. From the abbreviated name of the compound Gal(beta 1 -> 4)Glc, we know that:
a) C-4 of glucose is joined to C-1 of galactose by a glycosidic bond.
b) the compound is a D-enantiomer.
c) the galactose residue is at the reducing end.
d) the glucose is in its pyranose form.

33. Starch and glycogen are both polymers of:
a) fructose.
b) glucose1-phosphate.
c) sucrose.
d) a-D-glucose.

34. Which of the following statements about starch and glycogen is false?
a) Amylose is unbranched; amylopectin and glycogen contain many (a1 ® 6) branches.
b) Both are homopolymers of glucose.
c) Both serve primarily as structural elements in cell walls.
d) Both starch and glycogen are stored intracellularly as insoluble granules.

35. Which of the following is a heteropolysaccharide?
a) Cellulose
b) Chitin
c) Glycogen
d) Hyaluronate

Learn more:
Answers:
21. c) asymmetric.
22. b) fructose
23. c) glyceraldehyde.
24. d) they differ only in the configuration around one carbon atom.
25. b) D-glucose and D-mannose
26. d) a-D-glucose and b-D-glucose
27. c) hemiacetal.
28. d) a-D-glucose and b-D-glucose
29. d) Sucrose
30. c) glucose
31. b) D-gluconate.
32. a) C-4 of glucose is joined to C-1 of galactose by a glycosidic bond.
33. d) a-D-glucose.
34. c) Both serve primarily as structural elements in cell walls.
35. d) Hyaluronate

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