An organic molecule which moves down its concentration gradient and across a pore in a cell membrane without energy being expended by the cell is experiencing
A) simple diffusion
B) osmosis
C) active transport
D) facilitated diffusion

Question

Quizplus · Accepted Answer

The term "organic molecule" suggests that it is a compound that is too large or too polar to freely diffuse through the cell membrane, ruling out simple diffusion and osmosis. Since no energy is being expended by the cell, we can also rule out active transport. Facilitated diffusion involves the use of transport proteins to move substances down a concentration gradient, making it the best explanation for this scenario.

An Organic Molecule Which Moves Down Its Concentration Gradient and Across