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WAEC Biology 2015 Question 2

Question 2

Cell Structure and Organisation

The structure of the cell membrane is a

  1. A.double layer and a double protein layer.
  2. B.middle bi-layer of protein with a lipid layer on either surface.
  3. C.middle bi-layer of lipid with a protein layer on either surface.
  4. D.protein layer with two inner lipid layers.
Show the answer and explanation

Answer: C (middle bi-layer of lipid with a protein layer on either surface.)

Explanation

The cell membrane is built on a double layer of phospholipid molecules. Proteins sit on and in this lipid bilayer, so the lipid is in the middle and protein is on either surface.