What is the primary function of the phospholipid bilayer in cell membranes?

What is the primary function of the phospholipid bilayer in cell membranes?

Step 1: Understand that the cell membrane is like a protective barrier around the cell.
Step 2: Know that the phospholipid bilayer is made of two layers of phospholipids, which are special molecules.
Step 3: Realize that the phospholipid bilayer has a hydrophilic (water-attracting) side and a hydrophobic (water-repelling) side.
Step 4: Learn that this structure allows the membrane to be flexible and form a barrier.
Step 5: Understand that selective permeability means the membrane can choose what goes in and out of the cell.
Step 6: Recognize that small or non-polar substances can pass through easily, while larger or polar substances are blocked.

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