Answer:
The correct answer should be B: Adding sufficient heat would harm or kill a living thing.
Enzymes are the bio-catalysts which are used to increases the rate of biochemical reactions taking place in our body.
They increase the rate of a reaction by decreasing the activation energy. They do so by forming enzyme-substrate complex.
Our body does not use heat as a source of activation energy because:
- The system has to give larger amount of heat as compared to uncatalyzed reaction. It increases the energy utilization of the body.
- As the reactions are taking place in-vivo, the heat may harm or kill the living cells.
- It also may alter the structure of biomolecules such as DNA, RNA, proteins, and even substrate itself.
- In addition, heat is not specific as an enzyme is. It may alter more than one reaction at a time.
- Enzymes are not consumed in the reaction and hence they can be used again and again but heat has to be supplied every time a reaction takes place.
