Which of the Following is a Feature That Distinguishes Active

Question

Which of the following is a feature that distinguishes active transport from facilitated diffusion?
A)Saturation of transport rate
B)Requirement for a carrier molecule
C)Carrier molecules have specificity
D)Presence of a transport maximum
E)Requirement for metabolic energy

Accepted Answer

Active transport requires the input of metabolic energy to move a substance against its concentration gradient, while facilitated diffusion does not. The other options may apply to both active transport and facilitated diffusion.