An Enzyme Is Optimally Active at Neutral PH, but Activity

Multiple Choice

An enzyme is optimally active at neutral pH, but activity drops off sharply if the pH is changed, This enzyme is likely to have what in the active site?

A) the side chains of aspartate and glutamine
B) two histidine amino acid side chains
C) a glycine amino acid
D) polar side chains
E) nonpolar side chains