Which of the following is not a property of facilitated diffusion?
Facilitated diffusion encompasses carrier and channel mediated passive movement strictly down electrochemical gradient sharing discriminating features versus simple diffusion and active transport. Transport is obligately mediated by integral proteins with defined binding sites or selectivity filters conferring high specificity for instance GLUT1 preferring D-glucose over L-glucose tenfold and aquaporin excluding ions while passing water at billion per second via NPA motif. It is saturable because limited carriers or channels create Vmax plateau when all sites occupied enabling competitive inhi
Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Chapter 11: Properties of Facilitated Diffusion.
