Proteinaceous disc shaped structures associated with centromere of a chromosome are

Options

A. Kinetochores
B. Histones
C. Nucleoproteins
D. Telomeres

Answer

To solve the question regarding the proteinaceous disc-shaped structures associated with the centromere of a chromosome, we will analyze the options provided:

1. **Understanding the Question**: The question asks for a specific type of structure that is proteinaceous, disc-shaped, and associated with the centromere of chromosomes.

2. **Analyzing the Options**:
- **Telomeres**: These are located at the ends of chromosomes and are not disc-shaped. Therefore, this option is incorrect.
- **Nucleoproteins**: These are complexes of nucleic acids (like DNA or RNA) with proteins. They do not specifically refer to any disc-shaped structure associated with centromeres, making this option incorrect.
- **Histones**: These are proteins that help package DNA into structural units called nucleosomes. While they are proteinaceous, they are not disc-shaped and are not specifically associated with the centromere, so this option is also incorrect.
- **Kinetochores**: These are protein complexes that form on the centromere during cell division. They are disc-shaped structures and are crucial for the attachment of spindle fibers during metaphase. This makes kinetochores the correct answer.

3. **Conclusion**: The proteinaceous disc-shaped structures associated with the centromere of a chromosome are **kinetochores**.