As the ……… (A) ……… molecules cannot pass through the …… (B) ………. lipid bilayer, they require ….. (C) ……. to facilitate their transport across the membrane. Choose the correct combination respectively.

• A

  A - Non-polar
  B - Polar
  C - Transmembrane protein

• B

  A - Polar
  B - Non-polar
  C - Carrier protein

• C

  A - Polar
  B - Polar
  C - Transmembrane protein

• D

  A - Non-polar
  B - Non-polar
  C - Carrier protein