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MCAT BioChem Question — Enzyme Catalyst

An enzyme catalyst is kept in a solution buffered to the pH that maximizes activity for those enzymes found in the blood. The enzyme catalyzes a reaction that produces an acid whose pKa is 4.5. In this buffer solution, the acid product will be:   A) Primarily deprotonated B) Primarily protonated C) Protonated and deprotonated