Question

Which of the following statements is not correct?

• A. All enzymes found in cells are invariably proteins which catalyse biological reactions
• B. Enzymes act efficiently at a moderate temperature and p${}^H$
• C. Coenzymes increase the activities of enzymes
• D. Enzymes are not specific in their action on substrates

Answer 1

Answer: (D)

(A) Enzymes are proteins that catalyze biological reactions. Thus, the option A is correct.
(B) Enzymes act efficiently at a optimum value of temperature and pH. Thus, option B is incorrect.
(C) Co-enzymes do not increase the activities of enzymes. They help enzymes in the catalytic activity. Co-enzymes bind to the active site of the catalyst and participate in the enzyme activity. Thus, option C is incorrect.
(D) Enzymes are highly specific in their action on substrates.
Thus, option D is correct.