Which method f cellular defence is common in almost all eukaryotic organisms ?

Options

A. RNA interference
B. Reverse transcirption
C. VNTR
D. Phagocytosis

Answer

To answer the question regarding the common method of cellular defense in almost all eukaryotic organisms, we can break down the reasoning step by step:

### Step-by-Step Solution:

1. **Understanding Cellular Defense**: Cellular defense mechanisms are crucial for protecting organisms from pathogens, including viruses, bacteria, and other harmful entities.

2. **Evaluating Options**:
- **Option 1: RNA Interference**: This method is primarily used in plants and some eukaryotic organisms but is not universal across all eukaryotes.
- **Option 2: Reverse Transcription**: This process involves synthesizing DNA from RNA. It is particularly relevant in the context of viral infections, as many viruses have RNA as their genetic material. Eukaryotic cells can utilize reverse transcription to combat these viruses by creating DNA copies that can be degraded or otherwise neutralized.
- **Option 3: VNTR (Variable Number Tandem Repeats)**: This is a genetic marker and not a method of cellular defense.
- **Option 4: Phagocytosis**: This is a process where cells engulf and digest pathogens. While effective against bacteria, it is not effective against viruses, which often require different mechanisms for defense.

3. **Conclusion**: After evaluating the options, reverse transcription emerges as the most common method of cellular defense among eukaryotic organisms, particularly in response to viral infections.

### Final Answer:
The common method of cellular defense in almost all eukaryotic organisms is **Reverse Transcription**.

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