A team of scientists splices a human gene into bacterial plasmids. The human gene codes for insulin. Then the scientists use the plasmids to transform bacteria. Their goal is to develop bacteria that will synthesize insulin. How is it useful for the plasmids to also contain genes for antibiotic resistance?

A. The genes for antibiotic resistance increase the rate that bacteria take up the plasmids.
B. The genes for antibiotic resistance act as genetic markers for identifying the transformed bacteria.
C. The genes for antibiotic resistance help activate the gene for insulin.
D. The genes for antibiotic resistance help the transformed bacteria survive in their environment.