Step-by-step explanation:
Both phospholipid molecules and embedded proteins are
able to diffuse rapidly and laterally in the membrane. The
fluidity of the plasma membrane is necessary for the
activities of certain enzymes and transport molecules
within the membrane .and also The plasma membrane, or the cell membrane, provides
protection for a cell. It also provides a fixed environment
inside the cell, and that membrane has several different
functions. One is to transport nutrients into the cell and
also to transport toxic substances out of the cell .