why are enzymes most active at 40 degrees Celsius?

Answer 1

All enzymes are active at a certain optimal temperature. Not all enzymes are most active at one temperature.

To my knowledge most human enzymes are most active at 37, optimised by evolution to function most efficiently at normal body temperature. Other species have enzymes that function most efficiently at other temperatures.

An excellent example is the enzyme used in the polymerase chain reaction for amplifying DNA. This comes from a heat-loving bacterium called Thermus Aquaticus, which lives in the hot springs of Yellowstone national park. Because it lives at very high temperatures, evolution has favoured the survival of bacteria with enzymes functioning at high temperature - at the DNA polymerase from Thermus Aquaticus (commonly called Taq) has a temperature optimum of 80 degrees Celsius.

Answer 2

Enzymes are nothing but chemiclas, and any chemical reaction is directly proportional to the temprature.

Answer 3

because enzymes are chemicals, and like any other chemical reaction, the more heat there is (energy) the faster the reaction will occure.

Answer 4

Which enzyme?

Coz that is usually the body temp.