Most of the hydrolytic enzymes of lysosomes function at(a) Acidic pH(b) Basic pH(c) Neutral(d) None of the above

The correct answer is: (a) Acidic pH
Lysosomes are membrane-bound organelles that contain hydrolytic enzymes responsible for breaking down biomolecules, such as proteins, nucleic acids, carbohydrates, and lipids. These enzymes include proteases, nucleases, lipases, and glycosidases.
The hydrolytic enzymes within lysosomes function optimally at an acidic pH, typically around pH 4.5 to 5.0. This acidic environment is maintained by proton pumps (H⁺-ATPases) embedded in the lysosomal membrane, which actively transport hydrogen ions into the lysosome.
Why an Acidic pH is Important:
1. Enzyme Activation: The acidic pH ensures that lysosomal enzymes are in their active conformational states. At neutral or basic pH, these enzymes are less active or inactive.
2. Protective Mechanism: If lysosomal enzymes are accidentally released into the cytoplasm (pH ~7.2), their activity is significantly reduced, protecting the cell from self-digestion.
3. Optimal Substrate Breakdown: The acidic environment facilitates the breakdown of complex molecules into simpler ones, aiding cellular recycling and waste disposal.
Thus, the acidic pH is essential for lysosomal function, making option (a) Acidic pH the correct answer.