Bio1332 Biochemistry - Lecture Eighteen - Oxidative Phosphorylation

18 Questions | Total Attempts: 595

SettingsSettingsSettings
Please wait...
Bio1332 Biochemistry - Lecture Eighteen - Oxidative Phosphorylation

 1. Understand the process of oxidative phosphorylation  2. Know the enzyme complexes that make up the electron transport chain  3. Understand how electron transfer is linked to proton pumping  4. Understand how the proton gradient is linked to ATP production


Questions and Answers
  • 1. 
    Where in the mitochondria does oxidative phosphorylation occur?
  • 2. 
    What is the electron yield so far (all the stages of aerobic respiration before oxidative phosphorylation)?
  • 3. 
    Which of the following is true?
    • A. 

      Each carrier in the chain has lower free energy than the preceding member

    • B. 

      Each carrier in the chain has higher free energy than the preceding member

    • C. 

      Each carrier in the chain has the same free energy as the preceding member

  • 4. 
    Electrons flow spontaneously along the chain.True or False?
    • A. 

      True

    • B. 

      False

  • 5. 
    Please fill answer below:Electron-motive force is converted into a _______________ force, which is then converted into phosphoryl transfer potential.
  • 6. 
    Name the first complex in the electron transfer chain.
  • 7. 
    How many polypeptide chains does NADH-Q reductase consist of?
    • A. 

      34

    • B. 

      24

    • C. 

      12

    • D. 

      16

  • 8. 
    Name the prosthetic groups found in NADH-Q reductase.
  • 9. 
    Please fill answers below (separate answers with comma and space):The flow of two electrons from NADH to QH2 leads to the pumping of ______ H+ ions from the matrix into the _________________.The H+ can not diffuse back into the matrix, generating a _____________.
  • 10. 
    Name the second complex in the chain.
  • 11. 
    What happens at the second complex?
    • A. 

      FADH2 is oxidised and loses two electrons to coenzyme Q via Fe-S clusters

    • B. 

      FADH2 is oxidised and loses four electrons to coenzyme Q via Fe-S clusters

    • C. 

      FADH2 is oxidised and loses two electrons to coenzyme Q via FMNs

    • D. 

      FADH2 is oxidised and loses four electrons to coenzyme Q via FMNs

  • 12. 
    Name the 3rd complex in the chain.
  • 13. 
    Name the 4th complex in the chain.
  • 14. 
    Please fill answer below:​The only route for the protons to get back into the matrix from the intermembrane compartment is through ________________.
  • 15. 
    "The flow of H+ ions / protons through ATP synthase is needed, because ATP cannot be formed without proton flow through the complex."True or False?
    • A. 

      True

    • B. 

      False

  • 16. 
    Name an inhibitor of oxidative phosphorylation.
  • 17. 
    Please fill answer below: The tight coupling of electron transport and oxidative phosphorylation can be disrupted by _____________. These allow protons to flow back across the membrane without going through ATP synthase. ‘Proton leak’ 
Back to Top Back to top