Q: Glucose oxidase catalyses the conversion of glucose into gluconic acid with a pKa of 3.9. The buffer for glucose oxidase should be at pH 7 to maximize the activity of the enzyme. The gluconic acid produced would predominantly be in which state?
A		protonated
B		deprotonated
C		the protonated and deprotonated states would be roughly equivalent in concentration
D		there is no relationship between the protonation and the pH of the buffer

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