- A Only the outer leaflet
- B Only the inner leaflet
- C Both phospholipid layers completely
- D Between the cell wall and membrane
Correct answer: C. Both phospholipid layers completely
Explanation: Integral (transmembrane) proteins span the entire phospholipid bilayer, with portions exposed on both sides.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.