Final answer:
Lysosomal enzymes exhibit maximum activity at a pH around 4.5.
Step-by-step explanation:
Lysosomal enzymes, which aid in the breakdown of proteins, polysaccharides, lipids, nucleic acids, and organelles, exhibit maximum activity at a more acidic pH than the cytoplasm. The enzymes in lysosomes are called acid hydrolases because they catalyze hydrolysis reactions and their optimum pH is around 4.5.