The Citric Acid Cycle Quiz

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Questions and Answers

Which process provides more energy (ATP) from glucose than glycolysis?

  • Acetyl CoA production
  • Cellular respiration (correct)
  • Glycolysis
  • Lipid metabolism

What is the change in Gibbs free energy ($\Delta G'$) for the full oxidation of glucose?

  • -2,840 kJ/mol (correct)
  • -2,994 kJ/mol
  • -146 kJ/mol
  • 6 CO2 + 6 H2O

What are the three major stages of cellular respiration?

  • Acetyl CoA production, Glycolysis, Oxidative phosphorylation
  • Acetyl CoA production, Citric Acid Cycle, Oxidative phosphorylation
  • Glycolysis, Acetyl CoA production, Lipid metabolism
  • Glycolysis, Citric Acid Cycle, Oxidative phosphorylation (correct)

What is the main function of the Citric Acid Cycle (CAC)?

<p>To produce NADH and FADH2 (D)</p> Signup and view all the answers

What is the term for the reactions that replenish the intermediates of the Citric Acid Cycle?

<p>Anaplerotic reactions (B)</p> Signup and view all the answers

Which molecule is produced for each acetyl CoA that enters the TCA cycle?

<p>CO2 (C)</p> Signup and view all the answers

What is the net change in Gibbs free energy ($\Delta G'$) for glycolysis?

<p>-146 kJ/mol (C)</p> Signup and view all the answers

Which process captures energy stored in lipids and amino acids?

<p>Cellular respiration (A)</p> Signup and view all the answers

What is the term for the reactions that replenish the intermediates of the Citric Acid Cycle?

<p>Anaplerotic reactions (C)</p> Signup and view all the answers

What is the main function of the PDH (Pyruvate Dehydrogenase) enzyme?

<p>Acetyl CoA production (B)</p> Signup and view all the answers

Which process captures more energy (ATP) from glucose than glycolysis?

<p>Cellular Respiration (D)</p> Signup and view all the answers

What is the term for the reactions that replenish the intermediates of the Citric Acid Cycle?

<p>Anaplerotic reactions (D)</p> Signup and view all the answers

What is the change in Gibbs free energy ($\Delta G'$) for the full oxidation of glucose?

<p>-2,840 kJ/mol (D)</p> Signup and view all the answers

What are the three major stages of cellular respiration?

<p>Citric Acid Cycle, Acetyl CoA production, Glycolysis (B)</p> Signup and view all the answers

What is the main function of the Citric Acid Cycle (CAC)?

<p>To produce NADH and FADH2 (B)</p> Signup and view all the answers

Flashcards

Which yields more ATP: Glycolysis or Cellular Respiration?

Cellular respiration yields significantly more ATP from glucose compared to glycolysis alone.

ΔG' for glucose oxidation?

The full oxidation of glucose has a Gibbs free energy change of -2,840 kJ/mol.

Three stages of cellular respiration?

The three stages are Glycolysis, the Citric Acid Cycle, and Oxidative Phosphorylation.

Main function of the Citric Acid Cycle?

The primary role is to generate NADH and FADH2, which are essential for oxidative phosphorylation.

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Anaplerotic reactions?

Anaplerotic reactions replenish intermediates in the Citric Acid Cycle, ensuring it continues to function.

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CO2 produced per acetyl CoA?

For each acetyl CoA, two molecules of CO2 are produced in the TCA cycle.

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ΔG' for glycolysis?

The net change in Gibbs free energy for glycolysis is -146 kJ/mol.

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Captures energy from lipids/amino acids?

Cellular respiration captures energy from the breakdown of lipids and amino acids.

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Main function of PDH enzyme?

The PDH enzyme's main function is to convert pyruvate into Acetyl CoA, linking glycolysis to the Citric Acid Cycle.

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Study Notes

Cellular Respiration

  • Cellular respiration process that provides more energy (ATP) from glucose than glycolysis is the oxidative phosphorylation.

Thermodynamics

  • The change in Gibbs free energy ($\Delta G'$) for the full oxidation of glucose is -2870 kJ/mol.

Stages of Cellular Respiration

  • The three major stages of cellular respiration are glycolysis, the citric acid cycle, and oxidative phosphorylation.

Citric Acid Cycle (CAC)

  • The main function of the Citric Acid Cycle (CAC) is to produce energy for the cell by generating ATP, NADH, and FADH2.
  • The term for the reactions that replenish the intermediates of the Citric Acid Cycle is anaplerotic reactions.
  • For each acetyl CoA that enters the TCA cycle, one molecule of CO2, three molecules of NADH, and one molecule of FADH2 are produced.

Glycolysis

  • The net change in Gibbs free energy ($\Delta G'$) for glycolysis is -73.6 kJ/mol.

Energy from Lipids and Amino Acids

  • The process that captures energy stored in lipids and amino acids is beta-oxidation and the citric acid cycle.

Pyruvate Dehydrogenase (PDH) Enzyme

  • The main function of the PDH enzyme is to convert pyruvate into acetyl CoA, which then enters the citric acid cycle.

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