Solution:
Smaller, lipid-soluble molecules diffuse faster through the cell membrane, although some transporters, which are primarily proteins, aid the passage of hydrophilic compounds.
Smaller, lipid-soluble molecules diffuse faster through the cell membrane, but the movement of hydrophilic substances are facilitated by certain transporters which are chemically ____________.
Smaller, lipid-soluble molecules diffuse faster through the cell membrane, but the movement of hydrophilic substances are facilitated by certain transporters which are chemically ____________.