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| Modern Genetic Analysis Chapter 3. Gene Function Protein Function and Malfunction in Cells Figure 3-23. Schematic representation of the action of a hypothetical enzyme in putting two substrate molecules together. (a) In the "lock-and-key" mechanism the substrates have a complementary fit to the enzyme's active site. (b) In the induced-fit model, binding of substrates induces a conformational change in the enzyme.

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