Question

Which among the following is the incorrect statement about enzymes?

• A. Carbonic anhydrase is one of the fastest known enzymes.
• B. All enzymes except ribozymes are proteins but all proteins are not enzymes.
• C. Enzymes lower the activation energy necessary to transform a reactant into a product.
• D. Enzymes accelerate the rate of reaction by undergoing changes in themselves.

Answer 1

The correct option is D Enzymes accelerate the rate of reaction by undergoing changes in themselves.

a. The presence of carbonic anhydrase in the cytoplasm increases the speed of the reaction by 10 million times every second. Therefore it is known to be one of the fastest enzymes.

b. Ribozymes are RNA enzymes which catalyze certain biochemical reactions.

c. The energy required in making or breaking of chemical bonds of the substrate to form a product is known as activation energy. The activation energy for a bio-chemical change is lowered by enzymes and accelerates the rate of reaction.

d. Enzymes accelerate the rate of chemical reactions without undergoing any changes in themselves. Hence Last statement in the above question is incorrect.