CHEM 210 Biochemistry Module 4 Practice
Exam Questions And Correct Answers (Verified
Answers) Plus Rationales 2025 Q&A | Instant
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Topics: Metabolism – Energy Production, Electron Transport Chain, Oxidative
Phosphorylation, Lipid Metabolism
1. What is the primary purpose of the electron transport chain in cellular
respiration?
a) To break down glucose
b) To generate lactic acid
c) To produce ATP via oxidative phosphorylation
d) To produce oxygen
The ETC creates a proton gradient used by ATP synthase to generate
ATP.
2. Which of the following molecules donates electrons to the electron
transport chain?
, a) CO₂
b) ATP
c) NADH
d) Acetyl-CoA
NADH is an electron carrier that donates electrons to Complex I of
the ETC.
3. The final electron acceptor in the electron transport chain is:
a) NAD+
b) CO₂
c) O₂
d) H₂O
Oxygen accepts electrons at the end of the ETC and combines with
protons to form water.
4. Which complex in the ETC is also called cytochrome c oxidase?
a) Complex I
b) Complex II
c) Complex III
d) Complex IV
Complex IV transfers electrons to oxygen and pumps protons across
the mitochondrial membrane.
5. What is the primary function of ATP synthase?
a) Breakdown of glucose
b) Transfer of electrons
, c) Synthesis of ATP from ADP and Pi
d) Transport of protons into the matrix
ATP synthase uses the proton gradient to catalyze ATP synthesis.
6. The process of generating ATP using a proton gradient is called:
a) Substrate-level phosphorylation
b) Oxidative phosphorylation
c) Glycolysis
d) Gluconeogenesis
Oxidative phosphorylation uses the energy from proton movement to
make ATP.
7. Which complex of the ETC does not pump protons?
a) Complex I
b) Complex II
c) Complex III
d) Complex IV
Complex II transfers electrons from FADH₂ but does not pump
protons.
8. FADH₂ enters the ETC at which complex?
a) Complex I
b) Complex II
c) Complex III
d) Complex IV
, FADH₂ donates electrons to Complex II, which bypasses proton
pumping at Complex I.
9. How many ATP molecules are typically produced from one NADH via
the ETC?
a) 1
b) 2
c) 2.5
d) 3
Each NADH generates about 2.5 ATP during oxidative
phosphorylation.
10. How many ATP are typically produced from one FADH₂ via the
ETC?
a) 1
b) 2
c) 1.5
d) 3
FADH₂ generates fewer ATP because it enters the ETC later than
NADH.
11. Which metabolic pathway produces the most ATP?
a) Glycolysis
b) Citric acid cycle
c) Electron transport chain
Exam Questions And Correct Answers (Verified
Answers) Plus Rationales 2025 Q&A | Instant
Download PDF
Topics: Metabolism – Energy Production, Electron Transport Chain, Oxidative
Phosphorylation, Lipid Metabolism
1. What is the primary purpose of the electron transport chain in cellular
respiration?
a) To break down glucose
b) To generate lactic acid
c) To produce ATP via oxidative phosphorylation
d) To produce oxygen
The ETC creates a proton gradient used by ATP synthase to generate
ATP.
2. Which of the following molecules donates electrons to the electron
transport chain?
, a) CO₂
b) ATP
c) NADH
d) Acetyl-CoA
NADH is an electron carrier that donates electrons to Complex I of
the ETC.
3. The final electron acceptor in the electron transport chain is:
a) NAD+
b) CO₂
c) O₂
d) H₂O
Oxygen accepts electrons at the end of the ETC and combines with
protons to form water.
4. Which complex in the ETC is also called cytochrome c oxidase?
a) Complex I
b) Complex II
c) Complex III
d) Complex IV
Complex IV transfers electrons to oxygen and pumps protons across
the mitochondrial membrane.
5. What is the primary function of ATP synthase?
a) Breakdown of glucose
b) Transfer of electrons
, c) Synthesis of ATP from ADP and Pi
d) Transport of protons into the matrix
ATP synthase uses the proton gradient to catalyze ATP synthesis.
6. The process of generating ATP using a proton gradient is called:
a) Substrate-level phosphorylation
b) Oxidative phosphorylation
c) Glycolysis
d) Gluconeogenesis
Oxidative phosphorylation uses the energy from proton movement to
make ATP.
7. Which complex of the ETC does not pump protons?
a) Complex I
b) Complex II
c) Complex III
d) Complex IV
Complex II transfers electrons from FADH₂ but does not pump
protons.
8. FADH₂ enters the ETC at which complex?
a) Complex I
b) Complex II
c) Complex III
d) Complex IV
, FADH₂ donates electrons to Complex II, which bypasses proton
pumping at Complex I.
9. How many ATP molecules are typically produced from one NADH via
the ETC?
a) 1
b) 2
c) 2.5
d) 3
Each NADH generates about 2.5 ATP during oxidative
phosphorylation.
10. How many ATP are typically produced from one FADH₂ via the
ETC?
a) 1
b) 2
c) 1.5
d) 3
FADH₂ generates fewer ATP because it enters the ETC later than
NADH.
11. Which metabolic pathway produces the most ATP?
a) Glycolysis
b) Citric acid cycle
c) Electron transport chain
