Which of the Following Means of Transport Would Most Likely

Multiple Choice

Which of the following means of transport would most likely be used for moving a medium-sized molecule (like a monosaccharide or an amino acid) from a low concentration on the outside of a cell to a high concentration on the inside of a cell?

A) facilitated diffusion through an ion channel protein
B) facilitated diffusion through a transporter protein
C) active transport through a "pump" protein
D) passive transport