Question

Phospholipids are linear molecules with one polar end and one nonpolar end. How does this structure relate to their function in cell membranes? (SC.912.L.18.1)
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1 point
The polar tails of phospholipids form the outside of the cell membrane.
The nonpolar heads of phospholipids form the outside of the cell membrane.
The polar heads of phospholipids combine to form the middle of the cell membrane, with the tails on the outside.
The nonpolar tails of phospholipids combine to form the middle of the cell membrane, with the heads on the outside.

Answer 1

The correct answer is:
"The nonpolar tails of phospholipids combine to form the middle of the cell membrane, with the heads on the outside."

Explanation: Phospholipid heads are polar (hydrophilic) and face the watery environments inside and outside the cell; the nonpolar tails are hydrophobic and point inward, forming a middle layer that acts as a barrier to water-soluble substances.