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In fluid mosaic model of plasma membrane

1. upper layer is non-polar and hydrophilic
2. upper layer is polar and hydrophobic
3. phospholipids form a bimolecular layer in middle part
4. proteins form a middle layer

Correct answer: phospholipids form a bimolecular layer in middle part

Solution

In the fluid mosaic model, phospholipids spontaneously arrange into a bilayer because their hydrophilic heads face the aqueous environments and their hydrophobic tails avoid water. This creates a bimolecular layer in the middle of the membrane, while proteins are embedded within or attached to it rather than forming the central layer.

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