Final answer:
A defect in the lysosomal enzyme would likely lead to an accumulation of undigested material within the cell, which could interfere with cellular functions and potentially cause cell malfunction or death.
Step-by-step explanation:
If a cell had a defect in the lysosomal enzyme, it would most likely experience an accumulation of undigested material. Lysosomes, discovered by Christian de Duve, are responsible for breaking down various particles, including food, damaged organelles, microorganisms, or immune complexes. An enzyme defect within the lysosomes would lead to inefficient digestion, causing these particles to accumulate within the cell. The cell could also undergo autolysis if triggered, wherein lysosomes release their digestive enzymes into the cytoplasm, leading to cell death. Undigested materials can interfere with cellular functions, potentially causing cell malfunction or death.