Three of the following statements about enzymes are correct and one is wrong. which one is wrong?

Enymes require optimum pH for maximal activity

Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures 80^o-90^o C

Enzymes are highly specific

Most enzymes are proteins but some are lipids

Solution

Most enzymes are proteins but some are lipids

Enzymes show pH sensitivity and require an optimum pH for maximal acitivity.
Enzymes are thermolabile (heat sensitive) and denatured at high temperatures. However, extremophiles (thermophilic bacteria) are exceptions. Most of the enzymes are highly specific in their action. Most enzymes are proteins but exceptionally some are RNA enzymes, eg, ribozymes.