<span>Cannot be challenged in court i would say there a law about it</span>
        
             
        
        
        
answer of the question: B
 
        
                    
             
        
        
        
I believe the corre term to fill in the blank is "a protein gradient." Chemiosmosis uses a protein gradient to supply the energy necessary to phosphorylate adp to atp. It<span> is the diffusion of hydrogen ions (protons) across the biological membrane via the ATP synthase.</span>