Question

Each of the following are true of enzymes EXCEPT

a. they can be used over and over
b. they may not require cofactors
c. their active site is specific to the substrate
d. they increase the activations energy of a reaction
e. All of the following are true

Answer 1

Enzymes are biological catalysts that lower the activation energy of reactions. They can be used over and over again and are made up of amino acids. The correct answer is option d.

Step-by-step explanation:

Enzymes are biological catalysts that accelerate chemical reactions by lowering the activation energy. They are not consumed by the reactions they catalyze and can be used over and over again, making option a true. Enzymes are usually made of amino acids, so option b is also true.

They also lower the activation energy of reactions, facilitating the formation of the transition state and promoting the reaction, so option c is also true. However, enzymes do not increase the activation energy of a reaction, so option d is the answer and is not true.

Enzymes, like other catalysts, lower the activation energy of a reaction to increase the rate of reaction and are not consumed in the process. The false statement about enzymes is that 'they increase the activation energy of a reaction' as enzymes actually lower the activation energy to catalyze reactions efficiently.