In which part of interphase chromosome does transcription occur

Options

A. Telomere
B. Heterochromatin
C. Euchromatin
D. Centromere

Answer

To answer the question "In which part of interphase chromosome does transcription occur?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Interphase**: Interphase is the phase of the cell cycle where the cell is not dividing. During this time, the chromatin (the material that makes up chromosomes) is in a less condensed state, allowing for various cellular processes, including transcription.

2. **Identify Chromatin Types**: Chromatin can be categorized into two main types:
- **Euchromatin**: This is the less condensed form of chromatin that is actively involved in transcription. It appears lightly stained under a microscope and contains genes that are being expressed.
- **Heterochromatin**: This is the tightly packed form of chromatin that is generally not active in transcription. It appears darkly stained and contains genes that are usually not expressed.

3. **Analyze the Options**:
- **Telomeres**: These are the ends of chromosomes and do not participate in transcription.
- **Heterochromatin**: As mentioned, this is tightly packed and transcriptionally inactive.
- **Euchromatin**: This is the correct answer as it is the region of chromatin that is actively being transcribed during interphase.
- **Centromere**: This is the constricted region of a chromosome that separates it into two arms and is not involved in transcription.

4. **Conclusion**: Based on the analysis of the options, the part of the interphase chromosome where transcription occurs is **euchromatin**.

### Final Answer:
Transcription occurs in the **euchromatin** region of the interphase chromosome.

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