How do phospholipids contribute to cell membrane structure?
a. Phospholipids orient their heads towards the polar molecules and tails in the interior of the membrane, thus forming a bilayer.
b. Phospholipids orient their tails towards the polar molecules of water solutions, and heads in the interior of the membrane, thus forming a bilayer.
c. Phospholipids orient their heads towards the non-polar molecules and tails in the interior of the membrane, forming a bilayer.
d. Phospholipids orient their tails towards the polar molecules and heads in the non-polar side of the membrane, forming a bilayer.