Three of the following statements are wrong. one is correct. which of the following statements is correct?
enzymes require optimum ph for maximal activity
enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures 80∘−90∘c
enzymes are highly specific
most enzymes are proteins but some are lipids

The incorrect statement is "Most enzymes are proteins but some are lipids" the others statements are correct regarding to the Enzymes.

Explanation:

Enzymes are complex macromolecules of globular proteins. However, many enzymes contain certain non-protein substances associated with them for their function, which are known as cofactors and can be organic or inorganic compounds. In addition, the enzymes are thermolabile, presenting their best performance at the ideal temperature. Enzyme activity decreases with increasing and increases with increasing temperature and stops at 0 degrees and above 80 degrees. However, the enzymes of the bacteria that inhabit the hot springs have an ideal temperature of 70 degrees or more. Enzymes also show maximum activity at optimal pH. Varying its activity with increasing or decreasing pH. Enzymes are specific in their action. An enzyme can catalyze only a specific type of reaction or even act on a specific substrate. For example, the enzyme lactase catalyzes the hydrolysis of lactose and no other disaccharides.