What shape would a graph of reaction velocity versus pH have for an enzyme that uses both a proton donor and a proton acceptor during catalysis both acid and base catalysis)?
A) sigmoidal
B) hyperbolic
C) exponential
D) bell-shaped
E) linear

Question

Quizplus · Accepted Answer

The graph would be bell-shaped because the enzyme activity depends on the presence of both a proton donor and a proton acceptor. At low pH, the enzyme may be too protonated, and at high pH, it may be too deprotonated, leading to optimal activity at an intermediate pH.

What Shape Would a Graph of Reaction Velocity Versus PH