Which of the following best explains why enzyme catalysis is affected by a change in pH? A. Change in pH alters ionization states of serine in the active site involved in nucleophilic catalysis B. The ionization states of his, asp and glu involved in acid/base catalysis are altered with change in pH C. Change in pH alters ionization states of contact amino acids in the active site D. All enzymes have optimum pH

Biochemistry
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Chapter1: Biochemistry: An Evolving Science
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Which of the following best explains why enzyme catalysis is affected by a change in pH?

A. Change in pH alters ionization states of serine in the active site involved in nucleophilic catalysis
B. The ionization states of his, asp and glu involved in acid/base catalysis are altered with change in pH
C. Change in pH alters ionization states of contact amino acids in the active site
D. All enzymes have optimum pH
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