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Home Biochemistry Oxidative Phosphorylation Comments

  • Question
  • In aerobic respiration, the compound that enters a mitochondrion is


  • Options
  • A. acetyl CoA
  • B. pyruvate
  • C. phosphoglyceraldehyde
  • D. oxaloacetate

  • Correct Answer
  • pyruvate 


  • Oxidative Phosphorylation problems


    Search Results


    • 1. Which of the following is not a feature of oxidative phosphorylation?

    • Options
    • A. Direct transfer of phosphate from a substrate molecule to ADP
    • B. An electrochemical gradient across the inner mitochondrial membrane
    • C. A membrane bound ATP synthase
    • D. A protonmotive force
    • Discuss
    • 2. The irreversibility of the thiokinase reactions (formation of initial acyl-CoA)

    • Options
    • A. make this activation reaction the committed step on the pathway
    • B. is due to the subsequent hydrolysis of the product
    • C. applies only to even-chain fatty acids
    • D. both (a) and (b)
    • Discuss
    • 3. How many molecules of acetyl-CoA are produced in oxidation of palmitic acid (C16), which involves seven rounds of oxidation?

    • Options
    • A. 6
    • B. 7
    • C. 8
    • D. 9
    • Discuss
    • 4. The three identical b subunits of the F1, complex during ATP synthesis have

    • Options
    • A. different affinities for ATP but not for ADP
    • B. different affinities for ADP but not for ATP
    • C. different affinities for ATP and for ADP
    • D. similar affinities for ADP and ATP
    • Discuss
    • 5. Membrane potential and the proton gradient

    • Options
    • A. are both required to make ATP
    • B. are sufficient, separately, to make ATP from ADP + Pi;
    • C. reinforce one another when respiratory inhibitors are present
    • D. cancel one another when uncouplers are present
    • Discuss
    • 6. How many CO2 molecules are exhaled for each O2 molecule utilized in cellular respiration?

    • Options
    • A. 1
    • B. 3
    • C. 6
    • D. 12
    • Discuss
    • 7. Coenzyme Q is involved in electron transport as

    • Options
    • A. directly to O2
    • B. a water-soluble electron donor
    • C. covalently attached cytochrome cofactor
    • D. a lipid-soluble electron carrier
    • Discuss
    • 8. A biological redox reaction always involves

    • Options
    • A. an oxidizing agent
    • B. a gain of electrons
    • C. a reducing agent
    • D. all of these
    • Discuss
    • 9. Lactic acid is produced by human muscles during strenuous exercise because of lack of

    • Options
    • A. oxygen
    • B. NAD+
    • C. glucose
    • D. ADP and Pi
    • Discuss
    • 10. The aerobic breakdown of glucose known as respiration involves

    • Options
    • A. electron transport phosphorylation
    • B. glycolysis
    • C. Krebs Cycle
    • D. all of the above
    • Discuss


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