Unit 3 · Exam weight 12–16%

Cellular Energetics

Enzymes, photosynthesis, and cellular respiration.

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Lessons

Biological catalysts lower activation energy.

Light energy → chemical energy stored in glucose.

Cellular Respiration

Glucose → ATP via glycolysis, Krebs, and the ETC.

Fitness & Molecular Diversity

Metabolic diversity supports survival in varied environments.

Featured diagram

Enzyme action and induced fit model with activation energy graph

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