A

product

Energy of activation without an enzyme

- Progress of reaction -

Figure 6.6 The Role of Enzymes Enzymes function as biological catalysts. (a) An enzyme catalyzes a chemical reaction by lowering the activation energy of the reaction. (b) A specific enzyme facilitates each step of a metabolic pathway.

Energy of activation without an enzyme

- Progress of reaction -

Starting compound

Enzyme a

Intermediate,

Enzyme b

Intermediate^

Enzyme c

End product

134 Chapter 6 Metabolism: Fueling Cell Growth High-energy bonds

Energy released in catabolic pathways

Energy released in catabolic pathways

Energy used in anabolic pathways

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