Active transport requires an gate on the surface of the cel
     Active transport requires a(n) _____, gate on the surface of the cell  channel on the surface of the cell  carrier protein on the surface of the cell  pore on the surface of the cell  enzyme on the surface of the cell 
  
  Solution
answer:
ACTIVE TRANSPORT:The process in which energy is used to move the particles of a substance from a region of lower concentration to a region of higher concentration through a cell membrane is called active transport.............
active transport requires a carrier protein on the surface of the cell............................

