Question

When a biochemical reaction is carried out in laboratory from outside of human body in absence of enzyme then the rate of reaction obtained is ${10^{ - 6}}$ times, then activation energy of reaction in presence of enzyme is

Answer 1

Biological catalyst is a protein and that protein speeds up the rate of a specific chemical reaction in a cell is called an enzyme. Enzymes are also known as biocatalysts.

Complete Step by step solution:
Activation energy is the minimum amount of extra energy which is required by reacting molecules to get transformed into product. It can also be thought of as a potential barrier or energy barrier.
The activation energy of any reaction is measured in joules per mole, kilojoules per mole or kilocalories per mole.
The Arrhenius equation gives the relationship between activation energy and the rate of the reaction. The equation is as follows,
$k = A{e^{ - {E_a}/\left( {RT} \right)}}$
where A is the pre-exponential factor, R is the universal gas constant, T is the temperature and k is the constant for the rate of reaction. ${E_a}$ is the activation energy for the reaction.
With the presence of the enzyme, the activation energy of the reaction is decreased. The reactant follows a different path and hence the activation energy is altered.
A catalyst hasten ups the rate of the reaction and it is not consumed in that reaction. Although the catalyst lowers the activation energy, it does not change the energies of reactants and products neither does it affect the equilibrium constant.
The activation energy of a biochemical reaction in presence of an enzyme will be different and less than the activation energy obtained in the laboratory.

Note:
An enzyme is never destroyed in a reaction and can be used over and over again. An enzyme acts as a catalyst and as we know that a catalyst takes part in the reaction without being consumed in the reaction.