Question

question 2
plasma membrane phospholipids:
a are arranged in a single layer
b have tails that face the exterior of the membrane
c are 95% cholesterol
d have polar (charged) tails
e have a hydrophilic head and hydrophobic tails

Explanation:

• Phospholipids in the plasma membrane form a bilayer, not a single layer (so A is wrong).
• The tails are hydrophobic and face the interior of the membrane (so B is wrong).
• Phospholipids are not 95% cholesterol (so C is wrong).
• The tails are non - polar (hydrophobic), not polar (so D is wrong).
• Phospholipids have a hydrophilic (polar) head and hydrophobic (non - polar) tails.

Answer:

E. have a hydrophilic head and hydrophobic tails