Question

Cell Division is initiated by

• A. Centriole
• B. Chromomere
• C. Centrosome
• D. Centromere

Answer 1

The correct option is C

Centrosome

The correct option is C:

Explanation of correct answer:-

1. Centrosomes are made up of two, barrel-shaped clusters of microtubules called “centrioles” and a complex of proteins that helps additional microtubules to form.
2. These proteins allow the centrosomes to start and stop the formation of microtubule proteins.
3. It helps organize the spindle fibers during mitosis.
4. Before cell division, the centrosome duplicates, and then, as division begins, the two centrosomes move to opposite ends of the cell.
5. Proteins are called microtubules to assemble into a spindle between the two centrosomes and help separate the replicated chromosomes into the daughter cells.

Explanation of incorrect answers:-

Option A

1. A centriole is a barrel-shaped organelle that lies next to the nucleus and within the centrosome in the cytoplasm.
2. Centrioles are very important for cell division because when the chromosomes are condensing to undergo mitosis, the centrioles form the areas for mitotic spindle formation and then those mitotic spindles go and attach to each of the chromosomes and pull the chromosomes to opposite ends of the cell to allow cytokinesis.

Option B

1. Chromomere is a bead-shaped linearly arranged chromatin granules along the length of the chromosomes.
2. Chromomere is visible during the prophase of both mitosis and meiosis.
3. These chromomeres are responsible to carry the genes during inheritance.

Option D

1. A centromere is the central region of a chromosome made up of highly condensed DNA.
2. Its main function is to hold the two sister chromatids together.
3. Centromere also provides sites for the attachment of spindle microtubules through kinetochores.

Final Answer:- Cell division is initiated by centrosomes.