Question

A strain that can grow in a minimal medium containing arginine, butNOT in a minimal medium containing citrulline or ornithine wouldhave a mutation in the gene that encodes for
Bread mold can grow in a minimal medium without supplements (wildtype) while certain mutated strains (mutants) can only grow in aminimal medium that is supplemented with specific intermediatesfound in the following metabolic pathway for argininesynthesis:
minimal-----> ornithine ------> citrulline ------>arginine, where enzyme 1 converts the precursor to ornithine,enzyme 2 converts ornithine to citrulline, and enzyme 3 convertscitrulline to arginine.

A) enzyme 1
B) enzyme 2
c) enzyme 3
D) both enzyme 1 and 3
E) both enzyme 2 and 3