Living cells have an intact phospholipid bilayer that separates the cell from its external environment; this structure is commonly referred to as the

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The plasma membrane, also known as the cell membrane, is composed of a phospholipid bilayer that separates the internal contents of the cell from its external environment. The other options (nucleus, mitochondria, endoplasmic reticulum) are all organelles within the cell and are not specifically responsible for separating the cell from its environment.

Living Cells Have an Intact Phospholipid Bilayer That Separates the Cell