The reactants that enzymes act upon are called substrates. Which of the following is true of enzymes and substrates?

They act on a specific type of substrate in a reaction

Explanation:

enzymes are substrate specific. That is to say they will take part in a reaction that has one specific type of substrate and no other. Lactase for example is an enzyme that is normally found in the small intestines. It is useful in the hydrolysis of lactose, a sugar found in milk. Lactase only participates in this reaction only. It will not hydrolyse other sugars or substrates that are not lactose.

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