Question

In an experiment, the enzyme lactase is added to milk in a test tube. The products obtained are glucose and galactose. Which of these CORRECTLY explains the function of the enzyme in this reaction? A) The enzyme molecules collide with the substrate and break it into simpler products. B) The enzyme has active sites where the substrate binds with the enzyme to break down the sugar. C) The substrate binds at the non-active sites of the enzyme, where it is broken down into simpler compounds. D) The substrate breaks the bonds of the enzyme, resulting in the formation of simpler products.

Answer 1

B) The enzyme has active sites where the substrate binds with the enzyme to break down the sugar.

Glucose and galactose are joined together by glycosidic linkages, and enzyme lactase actually breaks that bond in the disachharide lactose (in milk) to produce the two monosachharides glucose and galactose.