Which enzyme function do lysosomes perform in the cell?

• A. Synthesize proteins
• B. Digestion of macromolecules
• C. Store genetic material
• D. Regulate cellular metabolism

Answer: (B)

Lysosomes play a crucial role in cellular function by being the primary site for the digestion of macromolecules. They contain a range of hydrolytic enzymes responsible for breaking down various biological materials, such as proteins, lipids, carbohydrates, and nucleic acids. When macromolecules are taken up by the cell—either through endocytosis or autophagy—lysosomes fuse with the vesicles containing these materials to facilitate their breakdown into smaller, usable units. This process is essential for cellular homeostasis and waste management, as it allows cells to recycle components and eliminate damaged organelles and proteins.

The other functions mentioned, such as the synthesis of proteins or the storage of genetic material, are attributed to different cellular organelles. For example, protein synthesis primarily occurs in the ribosomes, and genetic material is stored within the nucleus. Additionally, while lysosomes may have a role in cellular metabolism by breaking down substances, they do not directly regulate metabolism like some other organelles, such as mitochondria. Thus, the function of lysosomes is distinctly aligned with digestion within the cell.