As Commonly Practiced in the Developed World Today, Doctors Screening

Multiple Choice

As commonly practiced in the developed world today, doctors screening for PKU infer the disease is present if the newborn has

A) too much of the substrate of the enzyme involved.
B) too little of the substrate of the enzyme involved.
C) too much of a product of the enzyme involved.
D) too little of a product of the enzyme involved.
E) too little of the enzyme.