That's a great question! While proteins are essential for controlling chemical reactions in a cell, they don't do it alone. Here's a breakdown:

Proteins are key players in chemical reactions:

* Enzymes: These are a specific type of protein that act as catalysts. Catalysts speed up chemical reactions without being consumed in the process. Enzymes are highly specific, meaning each enzyme usually works on only one or a few specific reactions. Think of them like tiny, specialized machines that carry out vital tasks within the cell.

* Structural proteins: These provide shape and support to cells and tissues. They also help organize and position enzymes within the cell, which is crucial for efficient chemical reactions.

But it's not just proteins:

* DNA: This carries the genetic code that instructs the cell to produce specific proteins.

* RNA: Acts as a messenger, carrying the instructions from DNA to the protein-making machinery.

* Small molecules: These can act as cofactors or coenzymes, which are necessary for some enzymes to function properly.

So, the answer is a bit more nuanced than a simple yes or no:

* Proteins, specifically enzymes, are the primary actors in controlling chemical reactions within a cell.

* However, they rely on a complex interplay with other molecules like DNA, RNA, and small molecules to function effectively.

Let me know if you have more questions about proteins, enzymes, or other aspects of cell biology!