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I was wondering if someone could explain this question in further detail. I understand why it's not answer choice (a) carbamoyltransferase, but I don't understand why it cannot be answer choice (b) argininosuccinate synthase. My thinking is if you have growth of both argininosuccinate and arginine on minimal medium, couldn't both enzymes be functioning correctly (or defective). In order to tell which enzyme was defective wouldn't you need to know what was in the minimal medium, and since they don't give us that you couldn't know the answer, unless you make an assumption of the composition of the minimal medium. Are they expecting us to make that assumption, and if so what should that assumption be? Am I just overthinking this or is my thought process completely off? HELP!
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