Question

why does an enzyme cease to function when it has become denatured? denaturation causes the substrate molecules to bind so tightly to the enzymes active site that the enzyme can no longer interact with other molecules of substrate. denaturation changes the three - dimensional shape of the active site of the enzyme, preventing it from binding to the substrate. denaturation changes the three - dimensional shape of the substrate molecules, preventing them from binding to the active site on an enzyme. denaturation breaks down the molecules of the substrate before they can bind to the active site of the enzyme. part d which statement is true about enzymes in the human body? enzymes in the human body always work better as the temperature increases. enzymes in the human body usually work best at normal body temperature. enzymes in the human body always work better as the temperature decreases. enzymes in the human body work just as well at any temperature.

Explanation:

For the first question, enzymes function based on their three - dimensional active site shape to bind with substrates. Denaturation changes the enzyme's active - site shape, not the substrate's shape or binding too tightly. For the second question, enzymes in the human body have an optimal temperature, which is normal body temperature. Higher or lower temperatures can decrease their activity.

Answer:

For the first question: Denaturation changes the three - dimensional shape of the active site of the enzyme, preventing it from binding to the substrate.
For the second question: Enzymes in the human body usually work best at normal body temperature.