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Cofactors

OCR AS-level BiologyEnzymesLesson 17 of 20

Cofactors are inorganic molecules that help enzymes carry out their functions as catalysts.

In multi-step biological pathways, the cofactors may transfer atoms or groups of atoms from one reaction to another or form part of the active site of the enzyme.

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Key terms in this lesson

active site
The region of an enzyme, with a shape complementary to its substrate, where the substrate binds and the reaction is catalysed.

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