9. Which of the following descriptions about ATP synthases is wrong? (A) They can be found in mitochondria, chloroplast and plasma membrane, (B) they account for the irreversible catalysis of ATP to ADP and Pi, (C) they can be classified as F-, V-, A-, or P-ATPases based on their functional differences, (D) the pH gradient acts as a 'battery' to store the electrochemical energy for ATP production, (E) none of the above.