Here's why:

* Enzymes are proteins: Almost all enzymes are proteins, meaning they are long chains of amino acids linked together.

* Protein synthesis: This process involves reading the genetic code from DNA and using that information to build the specific sequence of amino acids that makes up a protein.

* Gene expression: The process of protein synthesis is part of a larger process called gene expression, where the information encoded in a gene is used to create a functional product (like an enzyme).

In summary: The instructions for making an enzyme are found in a gene within DNA. Through transcription and translation, the genetic information is used to create the protein chain that forms the enzyme.