Step 1: Understand lysosomes.
Lysosomes are small organelles surrounded by a membrane. They are filled with strong digestive enzymes.
Step 2: Know their normal job.
They break down proteins, fats, carbohydrates and worn-out cell parts. They act like the cleaning and waste-disposal team of the cell.
Step 3: See what they digest.
They can digest damaged organelles, foreign particles, cell waste and even germs that enter the cell.
Step 4: Understand the nickname.
If the lysosome membrane bursts, its powerful enzymes spill out and start digesting the cell's own parts. This self-destruction is called autolysis.
Step 5: Rule out the other organelles.
Mitochondria make energy, ribosomes make proteins, and the Golgi apparatus packs and ships materials. None of these can destroy the cell this way.
Step 6: Conclude.
Because they can digest the whole cell, lysosomes are called the suicidal bags of the cell.
\[ \boxed{\text{Lysosome}} \]