Bacteria can be genetically engineered to produce human insulin. Before this method was developed, the only insulin available was that from cattle or pigs. It was obtained from extracts of animal pancreas. Which statements about the two methods are correct? W Large numbers of bacteria can be cultured in a small space. X Bacteria reproduce very quickly and make insulin quickly. Y People sometimes develop diseases from insulin taken from cows or pigs. Z The insulin produced in bacteria is not the same as that produced in the human pancreas.