How Do Enzymes Work? (AQA A-Level Biology): Flashcards

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How Do Enzymes Work?
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Activation energy

Min. energy to break bonds & form new ones

Enzymes

Biological catalysts that lower activation energy

How enzymes speed up reactions

Provide alternative pathway requiring less energy

What enzymes don't change

Overall energy change, final products of reaction

Effect of enzymes on activation energy

Makes it much lower

H2O2H_2O_2 source in cells

By-product of metabolism

Catalase function

Breaks down hydrogen peroxide into water & oxygen

H2O2H_2O_2 breakdown equation

2H2O22H2O+O22H_2O_2 \rightarrow 2H_2O + O_2

What happens without catalase?

H2O2H_2O_2 accumulates & damages components

Substrate

Molecule that binds to enzyme for reaction

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