What purpose do biochemists insert human genes into bacteria?

Biochemists insert human genes into bacteria to produce human proteins, which can be used for research, therapeutic, or industrial purposes. This process, known as recombinant DNA technology, allows for the mass production of proteins like insulin, antibodies, or enzymes that are otherwise difficult to obtain. It enables scientists to study gene function and protein interactions in a controlled environment, facilitating advances in medicine and biotechnology. Additionally, this technique can lead to the development of vaccines and treatments for various diseases.