CHEM 210 Module 2
Biochemistry Exam 2026/2027
– Practice Questions, 100%
Verified Answers & Detailed
Rationales Guaranteed Pass
(GRADED A+)
Question 1
Which level of protein structure is primarily stabilized by
peptide bonds?
A. Secondary
B. Tertiary
C. Primary
D. Quaternary
Answer: C. Primary
Rationale: The primary structure of a protein refers to the linear
sequence of amino acids connected by peptide bonds.
Question 2
,What type of bond is responsible for stabilizing the alpha-helix
structure of proteins?
A. Ionic bonds
B. Hydrogen bonds
C. Disulfide bonds
D. Peptide bonds
Answer: B. Hydrogen bonds
Rationale: Hydrogen bonds form between the carbonyl oxygen
and amide hydrogen within the protein backbone, stabilizing
alpha-helices.
Question 3
Which amino acid contains a sulfur atom and can form disulfide
bonds?
A. Glycine
B. Alanine
C. Cysteine
D. Valine
Answer: C. Cysteine
Rationale: Two cysteine residues can form a covalent disulfide
bond that contributes to protein stability.
Question 4
,Enzymes function primarily by:
A. Increasing reaction temperatures
B. Lowering activation energy
C. Raising activation energy
D. Altering equilibrium constants
Answer: B. Lowering activation energy
Rationale: Enzymes accelerate reactions by reducing the
activation energy required for the reaction to proceed.
Question 5
The region of an enzyme where the substrate binds is called the:
A. Active site
B. Binding pocket
C. Catalytic loop
D. Allosteric site
Answer: A. Active site
Rationale: The active site is the specific location where
substrate binding and catalysis occur.
Question 6
Competitive inhibitors reduce enzyme activity by:
, A. Binding irreversibly to the enzyme
B. Destroying the substrate
C. Competing with the substrate for the active site
D. Increasing product formation
Answer: C. Competing with the substrate for the active site
Rationale: Competitive inhibitors resemble the substrate and
compete for access to the active site.
Question 7
Which carbohydrate is classified as a monosaccharide?
A. Sucrose
B. Lactose
C. Glucose
D. Maltose
Answer: C. Glucose
Rationale: Glucose consists of a single sugar unit and is
therefore a monosaccharide.
Question 8
Sucrose is composed of which two monosaccharides?
A. Glucose and fructose
B. Glucose and galactose
Biochemistry Exam 2026/2027
– Practice Questions, 100%
Verified Answers & Detailed
Rationales Guaranteed Pass
(GRADED A+)
Question 1
Which level of protein structure is primarily stabilized by
peptide bonds?
A. Secondary
B. Tertiary
C. Primary
D. Quaternary
Answer: C. Primary
Rationale: The primary structure of a protein refers to the linear
sequence of amino acids connected by peptide bonds.
Question 2
,What type of bond is responsible for stabilizing the alpha-helix
structure of proteins?
A. Ionic bonds
B. Hydrogen bonds
C. Disulfide bonds
D. Peptide bonds
Answer: B. Hydrogen bonds
Rationale: Hydrogen bonds form between the carbonyl oxygen
and amide hydrogen within the protein backbone, stabilizing
alpha-helices.
Question 3
Which amino acid contains a sulfur atom and can form disulfide
bonds?
A. Glycine
B. Alanine
C. Cysteine
D. Valine
Answer: C. Cysteine
Rationale: Two cysteine residues can form a covalent disulfide
bond that contributes to protein stability.
Question 4
,Enzymes function primarily by:
A. Increasing reaction temperatures
B. Lowering activation energy
C. Raising activation energy
D. Altering equilibrium constants
Answer: B. Lowering activation energy
Rationale: Enzymes accelerate reactions by reducing the
activation energy required for the reaction to proceed.
Question 5
The region of an enzyme where the substrate binds is called the:
A. Active site
B. Binding pocket
C. Catalytic loop
D. Allosteric site
Answer: A. Active site
Rationale: The active site is the specific location where
substrate binding and catalysis occur.
Question 6
Competitive inhibitors reduce enzyme activity by:
, A. Binding irreversibly to the enzyme
B. Destroying the substrate
C. Competing with the substrate for the active site
D. Increasing product formation
Answer: C. Competing with the substrate for the active site
Rationale: Competitive inhibitors resemble the substrate and
compete for access to the active site.
Question 7
Which carbohydrate is classified as a monosaccharide?
A. Sucrose
B. Lactose
C. Glucose
D. Maltose
Answer: C. Glucose
Rationale: Glucose consists of a single sugar unit and is
therefore a monosaccharide.
Question 8
Sucrose is composed of which two monosaccharides?
A. Glucose and fructose
B. Glucose and galactose
