## Core Concept
Apoptosis, also known as programmed cell death, is a highly regulated process of cell elimination that plays a crucial role in maintaining tissue homeostasis and preventing disease. It involves a series of cellular changes, including cell shrinkage, chromatin condensation, and membrane blebbing, ultimately leading to cell death and removal without inducing inflammation.

## Why the Correct Answer is Right
The correct answer, **D. Cell swelling**, is not a feature of apoptosis. In apoptosis, cells undergo shrinkage, not swelling. Cell swelling is more characteristic of necrosis, a form of cell death that results from acute cellular injury and leads to inflammation.

## Why Each Wrong Option is Incorrect
- **Option A:** Cell membrane blebbing is a characteristic feature of apoptosis. During apoptosis, the cell membrane undergoes changes that lead to the formation of blebs, which are bubble-like structures.
- **Option B:** Chromatin condensation is another hallmark of apoptosis. The chromatin, or DNA, condenses and aggregates, often at the periphery of the nucleus.
- **Option C:** Fragmentation of DNA into nucleosomes is a key biochemical feature of apoptosis. This process involves the cleavage of DNA into smaller fragments, which is a critical step in the apoptotic pathway.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that apoptosis is a vital process for eliminating damaged cells or controlling cell numbers during development. Dysregulation of apoptosis is implicated in many diseases, including cancer, autoimmune disorders, and neurodegenerative diseases. Understanding the features of apoptosis, such as cell shrinkage and DNA fragmentation, can help in diagnosing and treating these conditions.

## Correct Answer: D. Cell swelling