<prompt> The lipid bilayer of cell membrane exist asSolidSemisolidGelFibres  <response>: The lipid bilayer shows free lateral movement of its components, hence the membrane is said to be fluid in nature. Fluidity enables the membrane to perform endocytosis and exocytosis. However, the components do not freely move from inner to outer layer or outer to inner layer flip-flop movement is restricted. During apoptosis programmed cell death, flip-flop movement occurs. Somewhat similar to a gel.Ref: DM Vasudevan, page no: 11 