Biology

The correct answer is: C.Allows small, non-polar molecules to pass through the cell membrane.

The phospholipid bilayer forms the fundamental structure of the cell membrane and plays a critical role in controlling what enters and exits the cell. Its main function is to act as a selective barrier. The bilayer is composed of hydrophobic (water-repelling) lipid tails and hydrophilic (water-attracting) phosphate heads. This arrangement creates a semi-permeable membrane that:

1.Allows small, non-polar molecules (such as oxygen, carbon dioxide, and steroid hormones) to pass through the membrane easily, as these molecules can dissolve in the lipid layer.

2.Blocks larger, cha...