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Under electron microscope , chromatin fi...

Under electron microscope , chromatin fibres apperar like beads in a string .The beads are appear like beads in a string. The beads are

A

Chromomeres

B

Nucleosomes

C

Solenoids

D

Chromonemas

Text Solution

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The correct Answer is:
**Step-by-Step Text Solution:** 1. **Understanding Chromatin Structure**: Chromatin is a complex of DNA and proteins found in the nucleus of eukaryotic cells. It plays a crucial role in packaging DNA into a more compact, dense shape. 2. **Observation Under Electron Microscope**: When chromatin fibers are observed under an electron microscope, they appear as a series of structures resembling beads strung together on a string. 3. **Identifying the Beads**: The "beads" in this analogy refer to specific structural units of chromatin. Each bead corresponds to a nucleosome. 4. **Defining Nucleosomes**: A nucleosome consists of a segment of DNA wrapped around a core of histone proteins. This structure is fundamental for the organization and compaction of DNA within the nucleus. 5. **Function of Nucleosomes**: Nucleosomes help in the packaging of DNA, allowing it to fit within the confines of the cell nucleus while also playing a role in gene regulation. 6. **Eliminating Other Options**: - **Chromomeres**: These are granules of chromatin but do not represent the "bead" structure. - **Solenoids**: This term refers to a higher-order structure of chromatin and is not directly what is seen as beads. - **Chromonema**: This refers to the condensed form of chromatin, which is not the same as the "beads" observed. 7. **Conclusion**: Therefore, the correct answer to the question is that the beads observed under an electron microscope are **nucleosomes**. ---
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