3.4

Cellular Energy

AP Biology

Cellular energy

Laws of thermodynamics in biology

First law: conservation of energy

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Second law: entropy increases

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Free energy ($G$)

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ATP: the energy currency

ATP structure

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ATP hydrolysis

ATP synthesis

The ATP cycle

Energy coupling

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Phosphorylation

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Electron carriers

Oxidation and reduction (redox reactions)

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Metabolic pathways

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Overview: photosynthesis vs cellular respiration

Vocabulary