Lesson 7.2.4
7.2.4 Oxidative phosphorylation and ATP synthase Quiz: Pearson Edexcel Biology, Unit 7
20 questions
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Lesson 7.2.4, Oxidative phosphorylation and ATP synthase: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 7: Run for your Life, written with Revision Ninja.
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The 20 questions
-
Where in the mitochondrion does oxidative phosphorylation take place?
- Inner membrane
- Intermembrane space
- Matrix
- Outer membrane
-
Where are protons pumped during electron transport in mitochondria?
- Outer membrane
- Mitochondrial matrix
- Cytoplasm
- Intermembrane space
-
What movement directly drives ATP synthesis by ATP synthase?
- Proton diffusion
- Water osmosis
- Electron transfer
- Sodium transport
-
What is the final electron acceptor in the mitochondrial electron transport chain?
- Water
- Oxygen
- NAD
- Carbon dioxide
-
What immediate problem occurs in oxidative phosphorylation if oxygen is absent?
- ATP synthase reverses
- Matrix pH drops
- Glucose stops entering
- Electron chain stalls
-
Why does reduced NAD yield more ATP than reduced FAD?
- Greater proton load
- Earlier chain entry
- Higher molecular mass
- Faster diffusion rate
-
What is the main function of mitochondrial cristae in respiration?
- Increase surface area
- Store excess pyruvate
- Pump protons out
- Synthesise glucose
-
Which molecules deliver most electrons to the mitochondrial electron transport chain?
- Reduced coenzymes
- Glucose molecules
- Pyruvate molecules
- ATP molecules
-
Which complex in the electron transport chain receives electrons directly from reduced FAD?
- Complex III
- Complex I
- Complex II
- Complex IV
-
Into which space are protons pumped during electron transport in mitochondria?
- Intermembrane space
- Mitochondrial matrix
- Outer membrane
- Cytoplasm
-
What happens to electron transport in mitochondria if oxygen is absent?
- It continues normally
- It accelerates
- It stops
- It produces glucose
-
Which membrane property is essential for maintaining the proton gradient in chemiosmosis?
- Fluidity of lipids
- Permeability to ATP
- High water permeability
- Impermeability to protons
-
How much ATP is produced from 10 reduced NAD (2.5 ATP each) and 2 reduced FAD (1.5 ATP each)?
- 28 ATP
- 25 ATP
- 30 ATP
- 32 ATP
-
If a chemical makes the inner mitochondrial membrane leaky to protons, how is energy lost?
- As kinetic energy
- As glucose
- As heat
- As light
-
What happens to the proton gradient across the inner membrane if ATP synthase is blocked?
- It is destroyed
- It decreases
- It increases
- It remains unchanged
-
What couples electron transport to ATP synthesis in oxidative phosphorylation?
- Sodium gradient
- Pyruvate yield
- Proton gradient
- Phosphate concentration
-
Which coenzyme donates electrons to complex I of the electron transport chain?
- Coenzyme A
- Reduced FAD
- Oxidised NAD+
- Reduced NAD
-
How does an increased concentration of ADP affect the rate of oxidative phosphorylation?
- Decreases the rate
- Stops the process
- Has no effect
- Increases the rate
-
What type of gradient stores energy across the inner mitochondrial membrane during chemiosmosis?
- Thermal gradient
- Gravitational gradient
- Concentration gradient only
- Electrochemical gradient
-
Why is an intact inner mitochondrial membrane required for ATP synthesis?
- Maintains proton gradient
- Absorbs oxygen
- Synthesises glucose
- Transports acetyl CoA
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