Question

what would one expect to see when looking at the external surface of a cell membrane?
○ parts of proteins
○ phospholipid bilayers
○ phospholipid heads
○ phospholipid tails and parts of proteins
○ phospholipid heads and parts of proteins

Explanation:

The cell membrane’s phospholipid bilayer has hydrophilic heads facing the external aqueous environment. Integral and peripheral proteins are embedded in or attached to the membrane, with parts of proteins exposed on the external surface. Thus, the external surface shows phospholipid heads and parts of proteins.

Answer:

E. phospholipid heads and parts of proteins