A bacterial strain is able to grow on rich medium (which contains all the amino acids,vitamins,and a variety of carbon sources)but not on minimal medium or on minimal medium supplemented with leucine.What could be the genotype(s)of this bacterial strain with respect to the arg and leu loci?

Question

Quizplus · Accepted Answer

The bacterial strain can grow on rich medium but not on minimal medium or minimal medium supplemented with leucine, indicating it requires both arginine and leucine for growth. This suggests mutations in both arg and leu loci that prevent the synthesis of these amino acids. Therefore, the correct genotypes would involve mutations (-) in both the arg and leu loci, as seen in option E.

A Bacterial Strain Is Able to Grow on Rich Medium