Uric acid is transported across epithelial cells in the kidneys by an organic acid transporter (OAT) membrane transport protein. The presence of another organic acid, probenecid, causes a decrease in the uric acid transport rate. What characteristic of transporters is demonstrated by the decrease in uric acid transport in the presence of probenecid?

Competition

Explanation:

Transportation of some molecules can not be through simple diffusion due to their size or other factors.

Therefore carrier proteins known as transporters are needed to facilitate their transportation.

Transporters exhibit or demonstrate characteristics such as competition,

During competition, presence of a certain molecule decreases the transportation of another molecule.

When Uric acid transportation is decreased due to the presence of probenecid is a good example of competition.