Carrier-mediated transport
A)involves a specific membrane protein
B)always moves substances against a concentration gradient
C)always requires energy expenditure
D)involves protein channels
E)all of these

Question

Quizplus · Accepted Answer

Carrier-mediated transport involves a specific membrane protein that binds to the substance being transported. This protein undergoes conformational changes to move the substance across the membrane with the concentration gradient. This process does not always require energy expenditure and is different from protein channels, which allow the passive movement of substances without binding.

Carrier-Mediated Transport