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  3. the activity of enzyme q requires a protonated histidine residue...

Question: the activity of enzyme q requires a protonated histidine residue...

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The activity of Enzyme Q requires a protonated histidine residue.

(a) If the pKa of this histidine is 6.0, would Enzyme Q be more active at pH 5.5 or 6.5? Explain.

(b) At what pH will Enzyme Q show 90% of maximal activity?

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