WAEC Biology 2015 Objective — Question 2

Question 2 of 50 from the West African Examinations Council (WAEC) Biology 2015 Objective paper, with the correct answer and a full explanation.

The structure of the cell membrane is a

A. double layer and a double protein layer
B. middle bi-layer of protein with a lipid layer on either surfaceCorrect
C. middle bi-layer of lipid with a protein layer on either surface
D. protein layer with two inner lipid layers

Explanation

The cell membrane is made up of proteins and lipids held together by non-covalent interactions - the protein part is sandwiched between two lipid layers, i.e. a middle bi-layer of protein with a lipid layer on either surface.

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