This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory chain, Subject name: Biochemistry
Least impoant in final pathway of Electron Chain Reaction is 
Select and explain. 
A. Ph, B. Temperature (morning), C. Enzyme concentration, D. Substrate concentration
C: Enzyme concentration
Answer: C: Enzyme concentration 
Explanation: The electrons are passed through a series of redox reactions, with a small amount of free energy used at three points to transpo hydrogen ions across a membrane. This process contributes to the gradient used in chemiosmosis. ... The endproducts of the electron transpo chain are water and ATP.