AP Biology Unit 3 Oxidative Phosphorylation

What are the two parts of oxidative phosphorylation?

• Glycolysis & Krebs cycle

• Krebs cycle & Electron transport chain

• Electron transport chain & Chemiosmosis

• Glycolysis & Chemiosmosis

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Where does oxidative phosphorylation take place?

• Chloroplast

• Mitochondrial cristae

• Mitochondrial matrix

• Cytosol

Which direction are protons pumped during the electron transport chain?

• Into the mitochondrial matrix

• Into the intermembrane space

• Into the cytosol

• Into the thylakoid

Which part of the cell will have the highest pH due to cellular respiration?

• Cytosol

• Mitochondrial matrix

• Intermembrane space

• Thylakoid

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How does the electron transport chain facilitate the synthesis of ATP?

• The ATP is synthesized at the end of the electron transport chain

• The ATP is synthesized by the protons combining with the oxygen in the electron transport chain

• The ATP is synthesized by the protons flowing down their concentration gradient after being pumped out by the ETC

• The ATP is synthesized by the ATP synthase found in the electron transport chain

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What is the function of decoupling oxidative phosphorylation in the electron transport chain?

• Generate heat to regulate body temperature in endotherms

• Generate heat to regulate body temperature in ectotherms

• Generate ATP to power cellular activity in cells

• Generate ATP to power activity in organisms

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What does the NADH and/or FADH₂ that is brought to the electron transport chain come from?

• Glycolysis

• Krebs cycle

• Pyruvate oxidation

• Cytoplasmic reactions

Where would you find an electron transport chain in a plant cell?

• Mitochondrial cristae

• Thylakoid membrane

• Endoplasmic reticulum

• Golgi bodies

Describe what would happen if the mitochondrial inner membrane was ruptured.

• ATP synthesis would be inhibited

• ATP synthesis would be promoted

• The electron transport chain would increase in activity

• The electron transport chain would decrease in activity

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FUN FACT: How many ATPs are synthesized from the energy carried by NADH and FADH₂ (on average)?

• 1 NADH = 1 ATP

  1 FADH₂ = 1 ATP

• 1 NADH = 2 ATP

  1 FADH₂ = 1 ATP

• 1 NADH = 3 ATP

  1 FADH₂ = 2 ATP

• 1 NADH = 2 ATP

  1 FADH₂ = 3 ATP

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