2021Enzymes - LS1.5

Enzymes - MUST KNOW!
1) Enzymes are proteins essential for lowering the activation energy of chemical reactions in the body.
2) Enzymes speed up the rate of chemical reactions.
3) Specific enzymes are specific to their reaction.
4) Enzymes are unchanged by the reactions and can be used over and over again for more of the same chemical reaction.

• Click once you understand all this!
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A student conducts an experiment to study the reaction of the enzyme lactase with the substrates sucrose and lactose. Both sucrose and lactose break down in the presence of an enzyme to form glucose. The table shows the experimental results.

Which conclusion is supported by the results of the experiment?

• The enzyme lactase reacts only with lactose to produce glucose

• The activity of the enzyme lactase is unaffected by a change in its temperature

• The reaction of sucrose with the enzyme lactase depends on the temperature of the solution

• The reaction of the enzyme lactase with a substrate is directly proportional to the amount of substrate present