Question

gene is a method of making copies of a
gene that uses bacteria.

check it

Explanation:

The concept here relates to gene cloning using bacteria, specifically "gene cloning" or more precisely, the process often involves techniques like using plasmids in bacteria to replicate a gene. The term that fits is "cloning" as gene cloning is a method to make copies of a gene, and bacteria (like E. coli with plasmids) are commonly used for this.

Answer:

cloning