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AP Biology Practice Questions

Category - Biology

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Which of the following processes produces ATP?

I. Oxidative phosphorylation
II. Krebs’ cycle
III. Glycolysis
  1. I only
  2. II only
  3. III only
  4. I and II only
  5. I, II, and III only
Explanation
Answer: E, I, II, and III only. All three processes produce ATP.

Key Takeaway: Glycolysis produces ATP as a result of metabolizing glucose into pyruvate. Pyruvate can be further metabolized in the Krebs’ cycle in which ATP is also produced. In oxidative phosphorylation, H+ ions are shuttled through a membrane protein called ATP synthase, which produces ATP as the ions are transported through it.
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