Answer:
b. They are a type of lipid
Explanation:
Enzymes are organic molecules of a protein nature and act on the chemical reactions of cells as organic catalysts, ie, speed up the processes without changing them. They are usually the most effective catalysts for their high specificity. For this reason, we can assume that the letter A and the letter C are correct.
Enzymes have a specific substrate binding region. The region is called the active site, the conformation of this region forms a perfect and unique fit between a given enzyme and a substrate, usually by transient covalent bonds. For this reason, we can consider that the letter D is also correct.
As mentioned earlier, enzymes are protein molecules, so it is incorrect to say that enzymes are a type of lipid.
