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- membrane-bounded cytoplasmic sacs containing enzymes that function for the most part in the breakdown of metabolites
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
- A lysosome is a membrane-bound cell organelle that contains digestive enzymes. Lysosomes are involved with various cell processes. They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria. If the cell is damaged beyond repair, lysosomes can help it to self-destruct in a process called programmed cell death, or apoptosis.