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BIO NMDCAT Factors that Affect the Rate of Enzyme Reactions
nmdcat.online July 11, 2026

Regarding pH, enzymes exhibit maximum activity only within a limited range because

A. Every enzyme has identical amino acid composition
B. Proper ionization of catalytic residues is maintained only near the optimum pH
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C. Substrate concentration is highest at optimum pH
D. Enzyme concentration increases automatically

📝 Explanation

Correct protonation of amino acid side chains is essential for substrate binding and catalysis. Extreme pH alters these charges.

📖 Additional Information

  • Every enzyme has identical amino acid composition
  • Proper ionization of catalytic residues is maintained only near the optimum pH
  • Substrate concentration is highest at optimum pH
  • Enzyme concentration increases automatically

Correct protonation of amino acid side chains is essential for substrate binding and catalysis. Extreme pH alters these charges.

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