text: The Circe effect is the large increase in this quantity due to electrostatic attractions.
full_question: The Circe effect is the large increase in this quantity due to electrostatic attractions. This quantity represents the x-axis of an Eadie-Hofstee plot. It can be estimated at first pass as k-cat divided by K-sub-m. One over this quantity is plotted on the y-axis of a Lineweaver-Burke plot. This quantity is limited by the rate of diffusion in carbonic anhydrase, which has an extremely high turnover number. This quantity's concentration at its half-maximum is called the Michaelis constant. For 10 points, name this quantity given by the Michaelis-Menten equation, the speed at which an enzyme converts substrate into product.
first_sentence: The Circe effect is the large increase in this quantity due to electrostatic attractions.
raw_answer: catalytic velocity [or v; or catalytic rate; or catalytic efficiency; accept "enzyme" in place of "catalytic;" or the effective rate constant; or obvious equivalents; prompt on turnover number; prompt on binding affinity]