Phospholipid molecules in a membrane are arranged with their ______ on the exterior and their _____ on the interior.

Question

a
hydrophobic heads….hydrophilic tails
b
hydrophilic heads…hydrophobic tails
c
hydrophobic tails…hydrophilic heads
d
nonpolar heads…polar tails

Answer 1

The correct answer is:

b. hydrophilic heads…hydrophobic tails

In a phospholipid bilayer, the hydrophilic (water-attracting) heads face outward towards the aqueous environment, while the hydrophobic (water-repelling) tails face inward, away from the water.