Answer:
The energy required to form transition state from the ground state of one mole of substrate molecules is termed activation energy.
Step-by-step explanation:
The substrate of a reaction is first transformed into a high energy state, the transition state which is then converted into the final product. The energy required to convert the one mole of substrate molecules into the transition state is termed activation energy. Activation energy serves as an energy barrier for a reaction. The enzyme speeds up the chemical reaction by lowering down the activation energy.