Final answer:
A strain that can grow in a plate containing arginine, but NOT in a plate containing citrulline or ornithine would have a mutation in the gene that encodes for the arginine biosynthesis pathway.
Step-by-step explanation:
A strain that can grow in a plate containing arginine, but NOT in a plate containing citrulline or ornithine would have a mutation in the gene that encodes for arginine biosynthesis pathway.