You are presented with the quiz "What is needed from cells for phosphatases to keep the proper pH?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cells secrete acids and bases to maintain the proper pH for enzymes to work" and "phosphatases are enzymes that remove phosphates from other enzymes". 

So, what's the best answer to the question?


 

        secretion of acids and bases   