A bacterial isolate that grows better on a nutrient agar plate supplemented with amino acids but still grows in a nutrient agar plate lacking amino acids suggests amino acids are trace nutrients for the isolate.

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The bacterial isolate's improved growth on a nutrient agar plate supplemented with amino acids, compared to its growth on a nutrient agar plate lacking amino acids, suggests that amino acids are growth factors or essential nutrients, not merely trace nutrients, for the isolate.

A Bacterial Isolate That Grows Better on a Nutrient Agar