Q. What is the effect of uncouplers on oxidative phosphorylation?
-
A.
Increase ATP production
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B.
Decrease oxygen consumption
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C.
Increase heat production
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D.
Inhibit electron transport
Solution
Uncouplers disrupt the proton gradient, leading to increased heat production instead of ATP.
Correct Answer:
C
— Increase heat production
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Q. What is the primary function of oxidative phosphorylation in cellular respiration?
-
A.
To produce glucose
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B.
To generate ATP
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C.
To consume oxygen
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D.
To produce carbon dioxide
Solution
Oxidative phosphorylation primarily generates ATP through the electron transport chain and chemiosmosis.
Correct Answer:
B
— To generate ATP
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Q. What is the primary source of electrons for the electron transport chain?
-
A.
Glucose
-
B.
NADH and FADH2
-
C.
Oxygen
-
D.
ATP
Solution
NADH and FADH2 are the primary sources of electrons for the electron transport chain.
Correct Answer:
B
— NADH and FADH2
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Q. What is the proton motive force?
-
A.
The energy from ATP hydrolysis
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B.
The gradient of protons across the membrane
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C.
The flow of electrons through the chain
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D.
The consumption of oxygen
Solution
The proton motive force is the gradient of protons across the inner mitochondrial membrane that drives ATP synthesis.
Correct Answer:
B
— The gradient of protons across the membrane
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Q. What is the role of ATP synthase in oxidative phosphorylation?
-
A.
To transport electrons
-
B.
To pump protons
-
C.
To synthesize ATP
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D.
To oxidize NADH
Solution
ATP synthase synthesizes ATP from ADP and inorganic phosphate using the proton gradient.
Correct Answer:
C
— To synthesize ATP
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Q. Which complex in the electron transport chain is responsible for pumping protons into the intermembrane space?
-
A.
Complex I
-
B.
Complex II
-
C.
Complex III
-
D.
Complex IV
Solution
Complex I (NADH dehydrogenase) pumps protons into the intermembrane space.
Correct Answer:
A
— Complex I
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Q. Which condition can inhibit oxidative phosphorylation?
-
A.
High oxygen levels
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B.
Low glucose levels
-
C.
Presence of cyanide
-
D.
High ATP levels
Solution
Cyanide inhibits Complex IV of the electron transport chain, blocking oxidative phosphorylation.
Correct Answer:
C
— Presence of cyanide
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Q. Which molecule serves as the final electron acceptor in the electron transport chain?
-
A.
NADH
-
B.
FADH2
-
C.
Oxygen
-
D.
Carbon dioxide
Solution
Oxygen is the final electron acceptor in the electron transport chain, forming water.
Correct Answer:
C
— Oxygen
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Q. Which of the following is a byproduct of oxidative phosphorylation?
-
A.
Lactic acid
-
B.
Oxygen
-
C.
Water
-
D.
Glucose
Solution
Water is produced as a byproduct when electrons combine with oxygen and protons.
Correct Answer:
C
— Water
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Q. Which of the following statements about oxidative phosphorylation is true?
-
A.
It occurs in the cytoplasm
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B.
It requires oxygen
-
C.
It produces lactic acid
-
D.
It is independent of the electron transport chain
Solution
Oxidative phosphorylation requires oxygen as the final electron acceptor in the electron transport chain.
Correct Answer:
B
— It requires oxygen
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