Reason About Data and Draw Conclusions From Them Practice Test

A physiology lab tests whether carbonic anhydrase (CA) accelerates CO$_2$ hydration in a buffered solution at 37°C. CO$_2$ is bubbled at a constant rate, and the time to reach pH 7.00 from an initial pH 7.40 is recorded at several CA concentrations.

Which conclusion is most supported by the data?

A drug candidate is evaluated for passive diffusion across a lipid membrane using a planar bilayer at 25°C. The compound is added to the donor side at the same initial concentration each trial, and the steady-state flux $J$ is measured while the membrane thickness is varied.

Which trend in the data is most consistent with Fick’s law for diffusion through a membrane?