Which of the following statements is not correct?

All enzymes found in cells are invariably proteins which catalyse biological reactions
Enzymes act efficiently at a moderate temperature and pH
Coenzymes increase the activities of enzymes
Enzymes are not specific in their action on substrates
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(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.

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