Before recombinant DNA techniques became available,human growth hormone was
A) isolated from children who produced excessive amounts of the hormone.
B) recovered from pituitary glands removed from human cadavers.
C) recovered from cow blood.
D) collected from many sources, such as slaughterhouses.
E) isolated from chicken eggs.

Question

Quizplus · Accepted Answer

Before recombinant DNA techniques became available, human growth hormone was recovered from pituitary glands removed from human cadavers. This method had a high risk of transmitting diseases such as Creutzfeldt-Jakob disease (CJD) and was also limited by the availability of human cadavers.

Before Recombinant DNA Techniques Became Available,human Growth Hormone Was