This is the British English definition of vague. View American English definition of vague. Change your default dictionary to American English. View the pronunciation for vague.
Fluid-mosaic model. 1  Plasma membrane consists of a phospholipid bilayer studded with proteins, polysaccharides, lipids. 2  The lipid bilayer is semipermeable Regulates passage of substances into and out of the cell. H2O and some small, uncharged, molecules (O2, CO2) can pass through.
It is sometimes called a plasma membrane. The cell membrane separates the cell from its external environment and from the neighboring cells. It also regulates the passage or transport of certain molecules into and out of the cell, while preventing the passage of others.