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CHEM 210 Biochemistry Module 2
Exam (2024/2025) – Portage Learning
Questions and Verified Answers |
100% Guarantee Pass
Question 1
Which of the following is a characteristic of monosaccharides?
A. They are insoluble in water.
B. They contain multiple glycosidic bonds.
C. They are simple sugars with a single saccharide unit.
D. They are always linear molecules.
Correct Answer: C. They are simple sugars with a single saccharide unit.
Rationale: Monosaccharides are the simplest carbohydrates, consisting of a single saccharide
unit. They are water-soluble (A is incorrect), lack glycosidic bonds (B is incorrect), and often
form cyclic structures (D is incorrect).
Question 2
What is the molecular formula of glucose?
A. C5H10O5
B. C6H12O6
C. C6H12O5
D. C7H14O7
Correct Answer: B. C6H12O6
Rationale: Glucose, a hexose monosaccharide, has the molecular formula C6H12O6, reflecting
six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
Question 3
Which monosaccharide is a ketose?
A. Glucose
B. Galactose
C. Fructose
D. Mannose
, 2
Correct Answer: C. Fructose
Rationale: Fructose is a ketose because its carbonyl group is a ketone (C=O) at carbon 2.
Glucose, galactose, and mannose are aldoses with an aldehyde group (CHO) at carbon 1.
Question 4
What type of glycosidic bond links glucose and fructose in sucrose?
A. α-1,4
B. β-1,4
C. α-1,2
D. β-1,2
Correct Answer: C. α-1,2
Rationale: Sucrose is a disaccharide formed by an α-1,2 glycosidic bond between the anomeric
carbon of glucose (carbon 1, α configuration) and the anomeric carbon of fructose (carbon 2).
Question 5
Which polysaccharide serves as an energy storage molecule in plants?
A. Cellulose
B. Starch
C. Glycogen
D. Chitin
Correct Answer: B. Starch
Rationale: Starch, composed of amylose and amylopectin, is the primary energy storage
polysaccharide in plants. Cellulose (A) is structural, glycogen (C) is for animals, and chitin (D) is
in exoskeletons.
Question 6
What is the primary structural difference between amylose and amylopectin?
A. Amylose has β-1,4 glycosidic bonds; amylopectin has α-1,4 bonds.
B. Amylose is branched; amylopectin is unbranched.
C. Amylose has α-1,4 glycosidic bonds; amylopectin has α-1,4 and α-1,6 bonds.
D. Amylose is a disaccharide; amylopectin is a monosaccharide.
Correct Answer: C. Amylose has α-1,4 glycosidic bonds; amylopectin has α-1,4 and α-1,6
bonds.
CHEM 210 Biochemistry Module 2
Exam (2024/2025) – Portage Learning
Questions and Verified Answers |
100% Guarantee Pass
Question 1
Which of the following is a characteristic of monosaccharides?
A. They are insoluble in water.
B. They contain multiple glycosidic bonds.
C. They are simple sugars with a single saccharide unit.
D. They are always linear molecules.
Correct Answer: C. They are simple sugars with a single saccharide unit.
Rationale: Monosaccharides are the simplest carbohydrates, consisting of a single saccharide
unit. They are water-soluble (A is incorrect), lack glycosidic bonds (B is incorrect), and often
form cyclic structures (D is incorrect).
Question 2
What is the molecular formula of glucose?
A. C5H10O5
B. C6H12O6
C. C6H12O5
D. C7H14O7
Correct Answer: B. C6H12O6
Rationale: Glucose, a hexose monosaccharide, has the molecular formula C6H12O6, reflecting
six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
Question 3
Which monosaccharide is a ketose?
A. Glucose
B. Galactose
C. Fructose
D. Mannose
, 2
Correct Answer: C. Fructose
Rationale: Fructose is a ketose because its carbonyl group is a ketone (C=O) at carbon 2.
Glucose, galactose, and mannose are aldoses with an aldehyde group (CHO) at carbon 1.
Question 4
What type of glycosidic bond links glucose and fructose in sucrose?
A. α-1,4
B. β-1,4
C. α-1,2
D. β-1,2
Correct Answer: C. α-1,2
Rationale: Sucrose is a disaccharide formed by an α-1,2 glycosidic bond between the anomeric
carbon of glucose (carbon 1, α configuration) and the anomeric carbon of fructose (carbon 2).
Question 5
Which polysaccharide serves as an energy storage molecule in plants?
A. Cellulose
B. Starch
C. Glycogen
D. Chitin
Correct Answer: B. Starch
Rationale: Starch, composed of amylose and amylopectin, is the primary energy storage
polysaccharide in plants. Cellulose (A) is structural, glycogen (C) is for animals, and chitin (D) is
in exoskeletons.
Question 6
What is the primary structural difference between amylose and amylopectin?
A. Amylose has β-1,4 glycosidic bonds; amylopectin has α-1,4 bonds.
B. Amylose is branched; amylopectin is unbranched.
C. Amylose has α-1,4 glycosidic bonds; amylopectin has α-1,4 and α-1,6 bonds.
D. Amylose is a disaccharide; amylopectin is a monosaccharide.
Correct Answer: C. Amylose has α-1,4 glycosidic bonds; amylopectin has α-1,4 and α-1,6
bonds.
