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Which chemical reaction parameter shifts significantly when increasing electrolyte ionic strength around a protein?

A)Michaelis constant (Km)
B)Reaction equilibrium constant (K)
C)Arrhenius frequency factor (A)
D)Protonation constant (pKa)

💡 Explanation

When ionic strength increases, charge screening affects protein-substrate electrostatic interactions by modulating binding affinity, influencing the apparent value of Michaelis constant Km, which reflects substrate concentration at half-maximal reaction velocity. Therefore the Km shifts, rather than K, A, or pKa, whose primary dependencies lie elsewhere.

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