Protein synthesis — practice question

Researchers followed how two enzyme-catalysed reactions developed, using dopa oxidase and neutrase. Because each reaction altered the look of its reaction mixture, the progress could be tracked by the change in appearance. The reactions are illustrated in Fig. 3.1. For dopa oxidase: L-dopa (colourless solution) → dopachrome (orange-brown solution). For neutrase: casein + water (white solution) → peptides (short chains of amino acids) (colourless solution). Since the appearance of the mixtures changes, a colorimeter can be used to monitor the reactions. Fig. 3.2 presents the progress of the reaction catalysed by dopa oxidase as recorded from a colorimeter. Fig. 3.3 presents the progress of the reaction catalysed by neutrase as recorded from a colorimeter.