ATP Production from Glucose

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Questions and Answers

What is the net gain of ATP from glycolysis?

  • 1 ATP
  • 6 ATP
  • 4 ATP
  • 2 ATP (correct)

Into how many molecules of pyruvate is one glucose molecule broken down during glycolysis?

  • 3
  • 2 (correct)
  • 4
  • 1

How many ATP are directly produced from two cycles of the citric acid cycle?

  • 4
  • 1
  • 3
  • 2 (correct)

What are NADH and FADH2 used for in oxidative phosphorylation?

<p>Electron transport chains (D)</p> Signup and view all the answers

How many ATP molecules can be produced during oxidative phosphorylation?

<p>34 (D)</p> Signup and view all the answers

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Study Notes

ATP Production from Glucose

  • Cells produce ATP from glucose in 3 main stages.

Stage 1: Glycolysis

  • One glucose molecule breaks down into two pyruvate molecules.
  • This process produces a net gain of 2 ATP.

Stage 2: Citric Acid Cycle

  • Each pyruvate is broken down in a cycle that must turn twice for each glucose molecule.
  • Two cycles produce 2 ATP directly and create NADH + FADH2.

Stage 3: Oxidative Phosphorylation

  • NADH + FADH2 are used in electron transport chains.
  • This stage can produce up to 34 ATP by using energy from electrons to create a proton gradient, which activates ATP synthase.

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