Answer:
e. They must maintain a pH of 7 in order to function properly.
Explanation:
The pH in lysosome is between 4,5 and 5 because that is the optimal pH for hydrolytic enzymes that are involved in hydrolysis.
The lysosome maintains its pH by pumping in protons from the cytosol via proton pumps and chloride ion channels. Vacuolar-ATPases are responsible for transport of protons and they require ATP hydrolysis for their function. The transport of chloride ions is performed by Cl−/H+ antiporter.