Cellular Respiration
This lesson connects molecular mechanisms, cell behavior and biological evidence. Instead of memorizing isolated terms, follow what changes, what is measured, where the process occurs and why the outcome matters to a living system.
Big idea
Glycolysis splits glucose in the cytoplasm into pyruvate, producing a small ATP yield and reduced carriers. Pyruvate-derived acetyl groups enter a mitochondrial cycle that releases carbon dioxide and loads electron carriers.
Learning goals
- Glycolysis: Glycolysis splits glucose in the cytoplasm into pyruvate, producing a small ATP yield and reduced carriers.
- Link reaction and Krebs cycle: Pyruvate-derived acetyl groups enter a mitochondrial cycle that releases carbon dioxide and loads electron carriers.
- Electron transport chain: Electrons move through inner-membrane proteins that pump protons and create an electrochemical gradient.
- Chemiosmosis: Protons flow through ATP synthase, coupling the gradient to phosphorylation of ADP.
- Oxygen and energy yield: Oxygen is the final electron acceptor in aerobic respiration, allowing continued electron flow and high ATP yield.
Core concepts
1. Glycolysis
Glycolysis splits glucose in the cytoplasm into pyruvate, producing a small ATP yield and reduced carriers.
Observation or application: Glycolysis can begin energy release even before oxygen-dependent stages.