H H O

figure 3-8

figure 3-8

(a) The peptide bond (shaded blue) that binds amino acids together to form a polypeptide results from a condensation reaction that produces water. (b) Polypeptides are commonly shown as a string of balls in this textbook and elsewhere. Each ball represents an amino acid.

Substrate

Products figure 3-9

Enzyme

O In the induced fit model of enzyme action, the enzyme can attach only to a substrate (reactant) with a specific shape. 0 The enzyme then changes and reduces the activation energy of the reaction so reactants can become products. G The enzyme is unchanged and is available to be used again.

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