After some internet-based research, I found out what are the choices. So, the right answer will be that the genetically engineered bacteria produce higher quality insulin. They don't.
The techniques of genetic engineering are used to introduce hybrid genes
for some desired substance into other organisms. In this example, the gene(s) required for insulin production is(are) inserted into
bacteria's DNA and as a result, the production of insulin in bacteria occurs. The genetically engineered bacteria are used because it is much cheaper and faster to produce insulin this way.
