Carbohydrates classification monosaccharides oligosaccharides and constituent monosaccharides - Question Bank

1. The glycosidic bond in polysaccharides like starch and cellulose is formed by the removal of:
A) A carbon dioxide molecule
B) A water molecule
C) An oxygen atom
D) A hydrogen atom
2. Which of the following is NOT a constituent monosaccharide of common disaccharides?
A) Glucose
B) Fructose
C) Galactose
D) Mannose
3. A carbohydrate that yields only glucose units upon hydrolysis is:
A) Sucrose
B) Lactose
C) Starch
D) Fructose
4. Which of the following is a classification of monosaccharides based on the number of carbons?
A) Aldose, Ketose
B) Hexose, Pentose
C) Alpha, Beta
D) D, L
5. What is the anomeric carbon in a cyclic monosaccharide?
A) The carbon atom bonded to two oxygen atoms.
B) The carbon atom that was originally the carbonyl carbon.
C) The carbon atom with the most hydroxyl groups.
D) The carbon atom furthest from the carbonyl group.
6. Which of the following is a common characteristic of monosaccharides?
A) They are always sweet.
B) They contain at least one hydroxyl group and one carbonyl group.
C) They are insoluble in water.
D) They are complex polymers.
7. The term 'carbohydrate' literally means:
A) Carbon and water
B) Hydrated carbon
C) Sweet carbon
D) Energy source
8. Which monosaccharide is a structural isomer of glucose?
A) Ribose
B) Xylose
C) Fructose
D) Arabinose
9. Raffinose, a trisaccharide, is composed of:
A) Glucose, Fructose, Galactose
B) Galactose, Glucose, Fructose
C) Glucose, Glucose, Fructose
D) Galactose, Galactose, Glucose
10. Which of the following is a trisaccharide?
A) Maltose
B) Lactose
C) Raffinose
D) Sucrose
11. The carbohydrate classification 'oligosaccharide' typically includes saccharides that yield how many monosaccharide units upon hydrolysis?
A) 2 to 10
B) 11 to 20
C) More than 20
D) Exactly 2
12. Which monosaccharide has the molecular formula C6H12O6?
A) Ribose
B) Xylose
C) Glyceraldehyde
D) Glucose
13. Which monosaccharide has the molecular formula C5H10O5?
A) Glucose
B) Fructose
C) Ribose
D) Galactose
14. What is the significance of the term 'L' in L-glucose?
A) Indicates levorotatory optical activity
B) Relates to the configuration of the lowest numbered chiral center
C) Denotes a cyclic structure
D) Specifies the presence of a ketone group
15. What is the significance of the term 'D' in D-glucose?
A) Indicates dextrorotatory optical activity
B) Relates to the configuration of the highest numbered chiral center
C) Denotes the presence of a double bond
D) Specifies the number of carbon atoms
16. In the glycosidic linkage of lactose (β-D-galactopyranosyl-(1→4)-D-glucopyranose), which carbon atoms are involved?
A) C1 of galactose and C4 of glucose
B) C1 of galactose and C2 of glucose
C) C4 of galactose and C1 of glucose
D) C2 of galactose and C1 of glucose
17. In the glycosidic linkage of sucrose (α-D-glucopyranosyl-(1→2)-β-D-fructofuranoside), which carbon atoms are involved?
A) C1 of glucose and C4 of fructose
B) C1 of glucose and C2 of fructose
C) C2 of glucose and C1 of fructose
D) C4 of glucose and C1 of fructose
18. What is the common name for beta-D-glucopyranosyl-(1→4)-D-glucose?
A) Maltose
B) Sucrose
C) Lactose
D) Cellobiose
19. What is the common name for alpha-D-glucopyranosyl-(1→4)-D-glucose?
A) Sucrose
B) Lactose
C) Maltose
D) Cellobiose
20. Which of the following is NOT a disaccharide?
A) Sucrose
B) Lactose
C) Starch
D) Maltose
21. Which of the following is NOT a monosaccharide?
A) Ribose
B) Xylose
C) Maltose
D) Arabinose
22. The cyclic form of fructose is predominantly formed through the reaction between the ketone group and which hydroxyl group?
A) C1 hydroxyl
B) C3 hydroxyl
C) C5 hydroxyl
D) C6 hydroxyl
23. The cyclic form of glucose is predominantly formed through the reaction between the aldehyde group and which hydroxyl group?
A) C2 hydroxyl
B) C3 hydroxyl
C) C4 hydroxyl
D) C5 hydroxyl
24. When a monosaccharide like glucose forms a ring structure, it can exist in alpha (α) and beta (β) anomeric forms. These forms are called:
A) Tautomers
B) Epimers
C) Anomers
D) Isomers
25. Trehalose is a disaccharide composed of two units of:
A) Glucose
B) Fructose
C) Galactose
D) Mannose
26. Cellobiose is a disaccharide composed of two units of:
A) Alpha-glucose
B) Beta-glucose
C) Fructose
D) Galactose
27. Maltose, malt sugar, is a disaccharide composed of:
A) Glucose and Fructose
B) Glucose and Galactose
C) Glucose and Glucose
D) Fructose and Fructose
28. Lactose, milk sugar, is a disaccharide composed of:
A) Glucose and Fructose
B) Glucose and Galactose
C) Galactose and Fructose
D) Galactose and Galactose
29. Sucrose is a disaccharide composed of which two monosaccharides?
A) Glucose and Galactose
B) Glucose and Fructose
C) Fructose and Galactose
D) Glucose and Glucose
30. What type of bond links monosaccharides in oligosaccharides and polysaccharides?
A) Peptide bond
B) Ester bond
C) Glycosidic bond
D) Hydrogen bond
31. Deoxyribose, a component of DNA, is a derivative of which pentose sugar?
A) Ribulose
B) Xylulose
C) Ribose
D) Arabinose
32. Ribose is a pentose sugar found in:
A) Starch
B) DNA and RNA
C) Cellulose
D) Glycogen
33. Galactose is an epimer of which common monosaccharide?
A) Fructose
B) Glucose
C) Mannose
D) Xylose
34. Which monosaccharide is also known as fruit sugar?
A) Glucose
B) Fructose
C) Maltose
D) Lactose
35. Which monosaccharide is known as blood sugar?
A) Fructose
B) Galactose
C) Glucose
D) Sucrose
36. Fructose is an example of a ketose with how many carbon atoms?
A) 3
B) 4
C) 5
D) 6
37. Glucose is an example of an aldose with how many carbon atoms?
A) 3
B) 4
C) 5
D) 6
38. What is the simplest ketose monosaccharide?
A) Glyceraldehyde
B) Dihydroxyacetone
C) Erythrose
D) Xylulose
39. What is the simplest aldose monosaccharide?
A) Glyceraldehyde
B) Dihydroxyacetone
C) Erythrose
D) Ribose
40. Monosaccharides with a ketone group are called:
A) Aldoses
B) Ketoses
C) Alcohols
D) Carboxylic acids
41. Monosaccharides with an aldehyde group are called:
A) Ketoses
B) Aldoses
C) Aldehydes
D) Ketones
42. What is the general formula for carbohydrates?
A) C_n(H_2O)_m
B) C_n(H_2O)_n
C) C_mH_{2n}O_n
D) C_n(H_2O)_{n+1}
43. Starch, cellulose, and glycogen are examples of:
A) Monosaccharides
B) Disaccharides
C) Oligosaccharides
D) Polysaccharides
44. Which type of carbohydrate yields a large number of monosaccharide units upon complete hydrolysis?
A) Monosaccharides
B) Oligosaccharides
C) Polysaccharides
D) Proteins
45. Sucrose, lactose, and maltose are common examples of:
A) Monosaccharides
B) Polysaccharides
C) Oligosaccharides
D) Lipids
46. Carbohydrates that yield two to ten monosaccharide units upon hydrolysis are classified as:
A) Monosaccharides
B) Oligosaccharides
C) Polysaccharides
D) Amino acids
47. Glucose and fructose are examples of which class of carbohydrates?
A) Polysaccharides
B) Oligosaccharides
C) Monosaccharides
D) Triglycerides
48. Which term describes carbohydrates that cannot be hydrolyzed further into simpler sugars?
A) Polysaccharides
B) Oligosaccharides
C) Monosaccharides
D) Disaccharides
49. What is the primary classification criterion for carbohydrates?
A) Presence of nitrogen
B) Number of carbon atoms
C) Sweetness
D) Number of hydroxyl groups and carbonyl group type
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