Phospholipids are important components of the plasma membrane. What does "A" represent on the diagram?

A) Phosphorus
B) Oxygen
C) Nitrogen
D) Polar (hydrophilic) region
E) Nonpolar (hydrophobic) region

Phospholipids

A class of lipids that are a major component of all cell membranes, forming bilayers that act as a barrier in cells.

Phosphorus

A chemical element with symbol P and atomic number 15, essential for life, involved in the formation of DNA and RNA, and a key component of ATP, the energy currency of cells.

Plasma Membrane

The plasma membrane is the lipid bilayer that encloses the cytoplasm of a cell, controlling the passage of substances in and out of the cell.