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Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

Imagine that twenty i.u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

Can someone me with 3 and 4 plz. this is for masteries test.