A strain of E.coli is trp^{− his− lac−}.Which medium would this bacterium grow on? A)minimal medium with lactose as the sugar, supplemented with histidine and tryptophan B)minimal medium with glucose as the sugar, supplemented with histidine and tryptophan C)minimal medium with glucose and lactose as the sugar D)minimal medium with glucose as the sugar

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This E. coli strain requires histidine and tryptophan for growth due to the his− and trp− mutations, respectively. It cannot utilize lactose as a carbon source because of the lac− mutation. Therefore, it can grow on a minimal medium with glucose (which it can metabolize) supplemented with histidine and tryptophan.

A Strain of E