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Home Biochemistry TCA Cycle Comments

  • Question
  • During cellular respiration, most of the ATP made, is generated by


  • Options
  • A. oxidative phosphorylation
  • B. photophosphorylation
  • C. glycolysis
  • D. substrate-level phosphorylation

  • Correct Answer
  • oxidative phosphorylation 


  • TCA Cycle problems


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    • 1. Most multi-cellular organisms obtain energy for the synthesis of ATP during oxidative phosphorylation from

    • Options
    • A. high energy phosphate compounds
    • B. a proton gradient across the inner mitochondrial membrane
    • C. a proton gradient across the cell membrane
    • D. a proton gradient across the outer mitochondrial membrane
    • Discuss
    • 2. How many molecules of ATPs are synthesized per NADH oxidation?

    • Options
    • A. 2
    • B. 1
    • C. 3
    • D. 4
    • Discuss
    • 3. Which one of the following is not the intermediate of Kreb's cycle?

    • Options
    • A. Isocitrate
    • B. Succinate
    • C. Fumarate
    • D. Stearate
    • Discuss
    • 4. Citric acid cycle occurs in

    • Options
    • A. cytoplasm
    • B. mitochondria
    • C. endoplasmic reticulum
    • D. golgi bodies
    • Discuss
    • 5. Standard redox potential for a substance is measured under standard condition and is expressed as

    • Options
    • A. mili-Ampere
    • B. Volt
    • C. without unit
    • D. Ohm
    • Discuss
    • 6. Important function of cholesterol is to

    • Options
    • A. modulate fluidity
    • B. enhance blood circulation
    • C. prevent bile salts formation
    • D. None of these
    • Discuss
    • 7. Most of the enzymes of the citric acid cycle in a eukaryotic cell are located in the

    • Options
    • A. inner mitochondrial membrane
    • B. cytosol
    • C. mitochondrial matrix
    • D. intermembrane space
    • Discuss
    • 8. The end product of glycolysis is pyruvate, which enters the citric acid cycle after being converted to

    • Options
    • A. acetic acid
    • B. acetyl-CoA
    • C. acetaldehyde
    • D. none of these
    • Discuss
    • 9. Which one is not the main protein in electron transport chain?

    • Options
    • A. NADH dehydrogenase
    • B. Cytochrome bc1 complex
    • C. Cytochrome oxidase
    • D. Citrate synthease
    • Discuss
    • 10. The enzymes of the TCA cycle in a eukaryotic cell are located in the

    • Options
    • A. nucleus
    • B. mitochondria
    • C. plasma membrane
    • D. lysosomal bodies
    • Discuss


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