The cell membrane consists of:
A) a double phospholipid layer with hydrophobic tails facing inward and the presence of integral and peripheral proteins
B) A glycoprotein layer containing phospholipids and cholesterol
C) A layer of fatty acids and globular proteins containing phospholipids and cholesterol
D) Cholesterol and phospholipid molecules enclosing a protein layer
E) A double layer of triglycerides and cholesterol
IMAT 2024 · Question 23
Q23 - Structure and function of the cell membrane
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The correct answer is A) a double phospholipid layer with hydrophobic tails facing inward and the presence of integral and peripheral proteins.
This is the fluid mosaic model: a phospholipid bilayer with the hydrophobic tails pointing inward, plus integral proteins going through it and peripheral proteins on the surface. Cholesterol and some carbohydrates are there in smaller amounts.
D describes the old "sandwich" model, with protein layers on the outside of the lipids, which turned out to be wrong. Triglycerides (E) are storage fat and don't build membranes.
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