Here's why:
* Catalytic proteins are enzymes: Enzymes are a specific class of proteins that act as biological catalysts, speeding up chemical reactions within cells.
* Many proteins have structural or regulatory functions: While enzymes are crucial for life, many other proteins serve different roles. Some provide structural support (like collagen), others transport molecules (like hemoglobin), and others regulate cellular processes (like hormones).
In summary: While enzymes are a very important class of proteins, they represent only a subset of the vast array of proteins found in living organisms.
