The production of insulin, which is used to treat people with diabetes, is done by using bacteria. The gene for insulin is inserted into the genetic code of the bacteria. The bacteria then produce insulin in the same way as other materials. Which explanation describes one reason why bacteria are able to produce insulin? a. All organisms produce insulin
b. Insulin is found only in humans.
c. Bacteria replicate all genes continuously
d. Bacteria and humans use comparable nucleotides in genes.