Question 3 / 5
In facilitated diffusion, a _____ is needed to help molecules move across the cell membrane.
A.
lipid
B.
amino acid
C.
carbohydrate
D.
protein
In facilitated diffusion, a _____ is needed to help molecules move across the cell membrane.
A.
lipid
B.
amino acid
C.
carbohydrate
D.
protein