Enzymes affect the reactions in living cells by changing

Enzymes affect reactions in living cells by increasing the pH of the reactants to speed the reaction. increasing the activation energy and slowing down the reaction. lowering the temperature of the surrounding to help slow the reaction. lowering the activation energy and increasing the speed of the reaction.

Explanation:

Enzymes affect the reactions in living cell by changing the energy barrier that reactants have to overcome before getting to products.

Enzymes catalyze reactions by lowering the activation energy of reactants.

Activation energy is the minimum energy that has to be summoned by reactants in a reaction before they can get to products.

When enzymes lower the activation energy, the reactants take a shorter route towards arriving at products as compared to when there are no enzymes. Thus, the rate of reaction is accelerated.

More on how enzyme works can be found here: