In regard to passive diffusion of substances through biological membranes:
A. requires energy sources such as ATP.
B. can be inhibited by metabolic poisons such as cyanide.
C. causes a substance to move from a lower to a higher concentration.
D. is a major process by which uncharged molecules can move through membranes.
E. causes the transport protein to change shape and mutate.
Passive diffusion of a substance requires no energy (ATP). Thus it will not be affected by a metabolic inhibitor (cyanide). As well, passive diffusion transfers uncharged (more lipid-soluble) molecules from a higher to a lower concentration.