Which of the following is a characteristic feature that distinguishes apoptosis from necrosis?

Question

Accepted Answer

D. Preservation of cell membrane integrity with formation of apoptotic bodies. ## Distinguishing Features of Apoptosis vs Necrosis

**Key Point:** Apoptosis is a controlled, energy-dependent process that maintains membrane integrity, while necrosis is an uncontrolled, passive process resulting in membrane rupture and inflammation.

### Apoptosis Characteristics
- Cell membrane remains **intact** initially, forming apoptotic bodies (membrane-bound fragments)
- Chromatin condenses (pyknosis) and DNA fragments at internucleosomal sites
- No inflammatory response — contents are contained within membrane
- Requires ATP and activation of caspase cascade
- Cell shrinks (pyknosis)

### Necrosis Characteristics
- Cell membrane **ruptures** early, releasing cellular contents
- Chromatin shows random fragmentation (not internucleosomal)
- Triggers inflammatory response due to release of danger-associated molecular patterns (DAMPs)
- Passive process, does not require ATP
- Cell swells (oncosis) due to loss of ion homeostasis

| Feature | Apoptosis | Necrosis |
|---------|-----------|----------|
| **Membrane integrity** | Preserved initially | Ruptured early |
| **Cell size** | Shrinkage | Swelling |
| **DNA fragmentation** | Internucleosomal (180–200 bp ladder) | Random |
| **Inflammation** | Absent | Present |
| **Energy requirement** | ATP-dependent | ATP-independent |
| **Morphology** | Apoptotic bodies | Cell lysis |

**High-Yield:** The intact membrane in apoptosis is the KEY feature that prevents spillage of cellular contents and inflammation, making it a "clean death" compared to necrosis.

**Clinical Pearl:** Apoptosis is the normal mechanism of cell death in development, immune regulation, and tissue homeostasis. Necrosis occurs in pathological conditions (ischemia, trauma, severe inflammation).

Answer

A. Accumulation of intracellular fluid leading to cell lysis

Answer

B. Release of inflammatory mediators and damage to adjacent tissues

Answer

C. Massive swelling of the cell with rupture of the plasma membrane

Which of the following is a characteristic feature that distinguishes apoptosis from necrosis?

Explanation

Distinguishing Features of Apoptosis vs Necrosis

Apoptosis Characteristics

Necrosis Characteristics

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Feature	Apoptosis	Necrosis
Membrane integrity	Preserved initially	Ruptured early
Cell size	Shrinkage	Swelling
DNA fragmentation	Internucleosomal (180–200 bp ladder)	Random
Inflammation	Absent	Present
Energy requirement	ATP-dependent	ATP-independent
Morphology	Apoptotic bodies	Cell lysis