CHEM 210 Biochemistry Module 5 Exam
(2024/2025) – Portage Learning Questions and
Verified Answers | 100% Guarantee Pass
Multiple-Choice Questions (1–20)
Question 1: Which monosaccharide is classified as a ketose?
A) Glucose
B) Fructose
C) Galactose
D) Mannose
Answer: B) Fructose
Rationale: Fructose is a ketose due to its ketone functional group, unlike glucose, galactose, and
mannose, which are aldoses.
Question 2: What is the primary functional group found in carbohydrates?
A) Amine
B) Hydroxyl
C) Carboxyl
D) Thiol
Answer: B) Hydroxyl
Rationale: Carbohydrates contain hydroxyl groups (-OH) and carbonyl groups, with hydroxyls
being the primary functional group.
Question 3: When two carbohydrates are epimers, how do they differ?
A) In length by one carbon
B) In configuration about one carbon
C) In their anomeric form
D) In their functional group
Answer: B) In configuration about one carbon
Rationale: Epimers differ in stereochemistry at one chiral carbon, such as glucose and galactose
at C4.
Question 4: What is released when lactose is formed from galactose and glucose?
A) Carbon dioxide
B) Water
C) Nitrogen
D) Oxygen
Answer: B) Water
Rationale: Lactose formation involves a condensation reaction, releasing water to form a
glycosidic bond.
, Question 5: What is the primary component of amylose and amylopectin?
A) β-D-glucose
B) α-D-glucose
C) Fructose
D) Galactose
Answer: B) α-D-glucose
Rationale: Amylose and amylopectin are starch polymers composed of α-D-glucose units linked
by glycosidic bonds.
Question 6: Which carbohydrate is a disaccharide?
A) Glucose
B) Sucrose
C) Cellulose
D) Glycogen
Answer: B) Sucrose
Rationale: Sucrose is a disaccharide composed of glucose and fructose, unlike the others, which
are mono- or polysaccharides.
Question 7: What type of bond links monosaccharides in disaccharides?
A) Peptide bond
B) Glycosidic bond
C) Phosphodiester bond
D) Hydrogen bond
Answer: B) Glycosidic bond
Rationale: Glycosidic bonds form between monosaccharides in disaccharides via condensation
reactions.
Question 8: Which polysaccharide is indigestible by humans?
A) Starch
B) Glycogen
C) Cellulose
D) Amylose
Answer: C) Cellulose
Rationale: Cellulose, with β-1,4 glycosidic bonds, is indigestible due to the lack of enzymes in
humans to break these bonds.
Question 9: What is the anomeric carbon in a monosaccharide?
A) The carbon with the most hydroxyl groups
B) The carbon involved in the glycosidic bond
C) The carbon with the carbonyl group
D) The terminal carbon
Answer: C) The carbon with the carbonyl group
Rationale: The anomeric carbon is the carbonyl carbon that becomes chiral upon ring formation,
forming α or β anomers.
(2024/2025) – Portage Learning Questions and
Verified Answers | 100% Guarantee Pass
Multiple-Choice Questions (1–20)
Question 1: Which monosaccharide is classified as a ketose?
A) Glucose
B) Fructose
C) Galactose
D) Mannose
Answer: B) Fructose
Rationale: Fructose is a ketose due to its ketone functional group, unlike glucose, galactose, and
mannose, which are aldoses.
Question 2: What is the primary functional group found in carbohydrates?
A) Amine
B) Hydroxyl
C) Carboxyl
D) Thiol
Answer: B) Hydroxyl
Rationale: Carbohydrates contain hydroxyl groups (-OH) and carbonyl groups, with hydroxyls
being the primary functional group.
Question 3: When two carbohydrates are epimers, how do they differ?
A) In length by one carbon
B) In configuration about one carbon
C) In their anomeric form
D) In their functional group
Answer: B) In configuration about one carbon
Rationale: Epimers differ in stereochemistry at one chiral carbon, such as glucose and galactose
at C4.
Question 4: What is released when lactose is formed from galactose and glucose?
A) Carbon dioxide
B) Water
C) Nitrogen
D) Oxygen
Answer: B) Water
Rationale: Lactose formation involves a condensation reaction, releasing water to form a
glycosidic bond.
, Question 5: What is the primary component of amylose and amylopectin?
A) β-D-glucose
B) α-D-glucose
C) Fructose
D) Galactose
Answer: B) α-D-glucose
Rationale: Amylose and amylopectin are starch polymers composed of α-D-glucose units linked
by glycosidic bonds.
Question 6: Which carbohydrate is a disaccharide?
A) Glucose
B) Sucrose
C) Cellulose
D) Glycogen
Answer: B) Sucrose
Rationale: Sucrose is a disaccharide composed of glucose and fructose, unlike the others, which
are mono- or polysaccharides.
Question 7: What type of bond links monosaccharides in disaccharides?
A) Peptide bond
B) Glycosidic bond
C) Phosphodiester bond
D) Hydrogen bond
Answer: B) Glycosidic bond
Rationale: Glycosidic bonds form between monosaccharides in disaccharides via condensation
reactions.
Question 8: Which polysaccharide is indigestible by humans?
A) Starch
B) Glycogen
C) Cellulose
D) Amylose
Answer: C) Cellulose
Rationale: Cellulose, with β-1,4 glycosidic bonds, is indigestible due to the lack of enzymes in
humans to break these bonds.
Question 9: What is the anomeric carbon in a monosaccharide?
A) The carbon with the most hydroxyl groups
B) The carbon involved in the glycosidic bond
C) The carbon with the carbonyl group
D) The terminal carbon
Answer: C) The carbon with the carbonyl group
Rationale: The anomeric carbon is the carbonyl carbon that becomes chiral upon ring formation,
forming α or β anomers.
