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Biology 201Cell respiration

Chapter 04 · Core concept

Cellular respiration

How cells convert glucose into usable energy through a connected sequence of reactions.

Keep this in mindMost ATP is produced during oxidative phosphorylation.

GlucosePyruvateATP

Quick check3 / 8

Where does the Krebs cycle take place?

B Mitochondrial matrix

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Cellular respirationGlucose becomes pyruvate in the cytoplasm

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Can you explain oxidative phosphorylation more simply?

Think of it as a tiny energy dam. Hydrogen ions build up on one side of a membrane, then flow back through ATP synthase—turning it like a turbine to make ATP.

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