CHEM 121 MODULE 8 EXAM:
COMPREHENSIVE BIOCHEMISTRY
QUESTIONS AND ANSWERS 2026/2027
UPDATE || 100% GUARANTEED PASS
1. Which of the following describes the relationship between D-glucose and D-galactose?
A. They are enantiomers.
B. They are anomers.
C. They are epimers at C-4.
D. They are structural isomers.
Answer: C
Conceptual Explanation: D-glucose and D-galactose differ only in the configuration of the
hydroxyl group at the C-4 position, making them epimers.
2. In the Haworth projection of a D-sugar, which direction does the CH2OH group point?
A. Up
B. Down
C. Right
D. Left
,Answer: A
Conceptual Explanation: In D-sugars, the CH2OH group (the terminal carbon) is
positioned above the ring (up) in a Haworth projection.
3. Which glycosidic linkage is found in cellulose, preventing its digestion by humans?
A. Alpha-1,4-glycosidic bond
B. Beta-1,4-glycosidic bond
C. Alpha-1,6-glycosidic bond
D. Beta-1,2-glycosidic bond
Answer: B
Conceptual Explanation: Cellulose consists of glucose units linked by beta-1,4-glycosidic
bonds, which human amylase cannot hydrolyze.
4. What is the product of the reaction between a monosaccharide and an alcohol in the
presence of an acid catalyst?
A. A hemiacetal
B. An ester
C. An ether
D. A glycoside
Answer: D
, Conceptual Explanation: The reaction of the anomeric hydroxyl group of a
monosaccharide with an alcohol forms an acetal known as a glycoside.
5. Which of the following is a non-reducing disaccharide?
A. Lactose
B. Maltose
C. Cellobiose
D. Sucrose
Answer: D
Conceptual Explanation: Sucrose is non-reducing because the glycosidic bond is formed
between the anomeric carbons of both glucose and fructose.
6. Which fatty acid would have the lowest melting point?
A. Stearic acid (18:0)
B. Arachidonic acid (20:4)
C. Linoleic acid (18:2)
D. Oleic acid (18:1)
Answer: B
Conceptual Explanation: Melting point decreases with increasing number of double
bonds and shorter chain length. Arachidonic acid has 4 double bonds.
COMPREHENSIVE BIOCHEMISTRY
QUESTIONS AND ANSWERS 2026/2027
UPDATE || 100% GUARANTEED PASS
1. Which of the following describes the relationship between D-glucose and D-galactose?
A. They are enantiomers.
B. They are anomers.
C. They are epimers at C-4.
D. They are structural isomers.
Answer: C
Conceptual Explanation: D-glucose and D-galactose differ only in the configuration of the
hydroxyl group at the C-4 position, making them epimers.
2. In the Haworth projection of a D-sugar, which direction does the CH2OH group point?
A. Up
B. Down
C. Right
D. Left
,Answer: A
Conceptual Explanation: In D-sugars, the CH2OH group (the terminal carbon) is
positioned above the ring (up) in a Haworth projection.
3. Which glycosidic linkage is found in cellulose, preventing its digestion by humans?
A. Alpha-1,4-glycosidic bond
B. Beta-1,4-glycosidic bond
C. Alpha-1,6-glycosidic bond
D. Beta-1,2-glycosidic bond
Answer: B
Conceptual Explanation: Cellulose consists of glucose units linked by beta-1,4-glycosidic
bonds, which human amylase cannot hydrolyze.
4. What is the product of the reaction between a monosaccharide and an alcohol in the
presence of an acid catalyst?
A. A hemiacetal
B. An ester
C. An ether
D. A glycoside
Answer: D
, Conceptual Explanation: The reaction of the anomeric hydroxyl group of a
monosaccharide with an alcohol forms an acetal known as a glycoside.
5. Which of the following is a non-reducing disaccharide?
A. Lactose
B. Maltose
C. Cellobiose
D. Sucrose
Answer: D
Conceptual Explanation: Sucrose is non-reducing because the glycosidic bond is formed
between the anomeric carbons of both glucose and fructose.
6. Which fatty acid would have the lowest melting point?
A. Stearic acid (18:0)
B. Arachidonic acid (20:4)
C. Linoleic acid (18:2)
D. Oleic acid (18:1)
Answer: B
Conceptual Explanation: Melting point decreases with increasing number of double
bonds and shorter chain length. Arachidonic acid has 4 double bonds.
