Lysosomes contain digestive enzymes used to degrade macromolecules or organelles. Which option best describes this statement?

• A. They contain digestive enzymes used to degrade macromolecules or organelles.
• B. They are the site of DNA replication.
• C. They synthesize lipids for the plasma membrane.
• D. They store iron for hemoglobin synthesis.

Answer: (A)

Lysosomes are the cell’s recycling centers. They house acidic hydrolases that break down macromolecules and damaged organelles delivered to them by autophagy or endocytosis. This digestive capability is exactly what the statement describes—the enzymes inside lysosomes degrade macromolecules or organelles to recycle their components. Other cellular processes occur in different places: DNA replication in the nucleus, lipid synthesis mainly in the smooth endoplasmic reticulum and Golgi, and iron storage is primarily in ferritin in the cytosol. So, describing lysosomes as containing digestive enzymes used to degrade macromolecules or organelles best captures their role.