question_answer 29)

Smaller, lipid soluble molecules diffuse faster through cell membrane, but the movement of hydrophilic substances are facilitated by certain transporters which are chemically .........

Answer:

                    Proteins. The movement of hydrophilic substances are facilitated by transporters which arechemically proteins. These proteins form porins, which are huge pores in the outermembranes of the plastids, mitochondria and some bacteria. These porins allow the smallmolecules to pass through the membrane.