Examine the simple metabolic pathway in the figure above.If A,B,and C are all substances required for growth of the organism that carries out this pathway,a strain that is mutant for the gene encoding enzyme 1 would be able to grow on which of the following media?

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Quizplus · Accepted Answer

The mutant strain lacking enzyme 1 would not be able to convert substrate A into substrate B, as a result, it would not be able to produce C. However, if nutrient B is provided, it will be able to take up B directly and produce C. Therefore, minimal medium supplemented with nutrient B only would allow the mutant strain to grow. The same logic applies to minimal medium supplemented with both A and B, as the mutant strain can take up nutrient B and produce C. However, minimal medium and minimal medium supplemented with nutrient A only would not allow growth as the mutant strain cannot produce the required C.

Examine the Simple Metabolic Pathway in the Figure Above