question_answer 50)

Identify a type of molecular movement which is highly selective and requires special membrane proteins, but does not require energy.  

Answer:

                  Facilitated diffusion's is the mechanism which is highly selective passive process. Infacilitated diffusion special proteins help in movement of substances across themembrane without expenditure of ATP energy because facilitated diffusion cause nettransport of molecules from a low to high concentration and this would not require input ofenergy.