Beadle and Tatum Discovered That Metabolic Pathways Are Studied Most

Multiple Choice

Beadle and Tatum discovered that metabolic pathways are studied most effectively using which of the following techniques?

A) using multiple gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway
B) adding intermediates to a metabolic pathway
C) removing all intermediates of a metabolic pathway
D) using single gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway