✔ 最佳答案
Enzymes are biological catalysts that catalzye chemical reactions in our bodies as the reactions themselves are too slow to proceed without the presence of enzymes. You are right, it is used to speed up a reaction as it provides an alternate pathway for the reaction with lower activation energy to proceed.
3. At low temperature, the enzyme molecules and substrate molecules are too slow to collide with each other, hence the enzymatic activity is low, known as inactivation of enzyme. (substrates are substances that would combine to the active site of the enzyme to obtain a faster reaction.)
4. At high temperature, the activity of enzyme increases due to the increase in kinetic energy, leading to more effective collisions between the enzyme and the substrate molecules. However, at a very high temperature, the enzyme would be denatured since the high temperature changes the confrontation (configuration) of the enzyme, diallowing the active site of the enzyme from catazying a reaction. This phenomenon is known as the denaturation of enzyme.