They contain enzymes that digest the cell's own material when the cell is damaged.
Explanation
Lysosomes are membrane-bound vesicular organelles found in eukaryotic cells. They are formed by the process of packaging in the Golgi apparatus and serve as the cell's waste disposal and digestive system.
Detailed Analysis:
- Composition: Lysosomes are rich in hydrolytic enzymes (hydrolases), such as lipases, proteases, and carbohydrases. These enzymes are optimally active at an acidic pH.
- Function as "Suicide Bags": The primary function of these enzymes is the digestion of carbohydrates, proteins, lipids, and nucleic acids. However, when a cell gets damaged or undergoes metabolic disturbance, the lysosomal membrane may rupture. This releases the potent enzymes into the cytoplasm, resulting in the digestion of the cell's own components. This process is scientifically termed autolysis.
- Justification for They contain enzymes that digest the cell's own material when the cell is damaged.: Since the bursting of lysosomes leads to the destruction of the cell itself, they are metaphorically referred to as the "suicide bags" of the cell.
- Analysis of Incorrect Options:
- They release toxins that kill the organism. is incorrect because lysosomes utilize digestive enzymes, not toxins, and the effect is localized to the cell rather than the entire organism.
- They are responsible for the programmed death of the organism. is incorrect because while lysosomes participate in apoptosis (programmed cell death), the term "suicide bag" specifically describes the autolytic destruction of a single cell due to damage, not the programmed death of the organism.
- They consume all the oxygen in the cell. is incorrect because oxygen consumption is the primary function of mitochondria during cellular respiration.
Key Takeaway:
Lysosomes are termed "suicide bags" because they contain powerful hydrolytic enzymes that digest the cell's own material (autolysis) when the cell is damaged.