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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