The portion of a DNA molecule that contains the information for making one protein is called a gene.

Here's a breakdown:

* DNA: Deoxyribonucleic acid, the molecule that carries genetic instructions.

* Gene: A segment of DNA that provides the code for a specific protein.

* Protein: A complex molecule made up of amino acids, which perform a wide range of functions in the body.

How it works:

1. Transcription: The DNA sequence of a gene is copied into a messenger RNA (mRNA) molecule.

2. Translation: The mRNA molecule travels to a ribosome, where it is used as a template to assemble amino acids into a protein chain.

So, a gene is like a blueprint for building a specific protein, and the protein itself is like the final product.