Which of the following transport processes is saturation kinetics NOT usually observed?
A. Phagocytosis.
B. Active transport.
C. Passive diffusion.
D. Facilitated diffusion.
Saturation of the carrier with the transferring substance in active transport and facilitated diffusion will lead to saturation kinetics. In addition, phagocytosis also has a maximum rate of transfer. Passive diffusion does not have any of these restrictions and normally proceeds at a rate proportional to the amount of substance present for transfer.