The rate of carrier-mediated transport is limited by
A) protein location in the membrane
B) osmolarity
C) tonicity
D) competition with other molecules
E) none of these

Question

Quizplus · Accepted Answer

Carrier-mediated transport involves specific proteins that can only transport certain molecules. These proteins can become saturated when they are transporting a high amount of molecules, and competition with other molecules can limit the rate of transport. Therefore, choice D, competition with other molecules, is the best choice. The protein location in the membrane, osmolarity, and tonicity can affect membrane transport but do not specifically relate to carrier-mediated transport.

The Rate of Carrier-Mediated Transport Is Limited by