Question

Which one of the following organelle is responsible for the formation of aster in the Cell Division?

• A. Ribosome
• B. Lysosome
• C. Centrosome
• D. Chromosome

Answer 1

The correct option is C

Centrosome

The correct option is C.

Explanation for Correct option:

1. An animal cell's aster is the star-shaped cellular structure that develops around each centrosome during mitosis or meiosis.
2. They usually consist of chromosomes and are related microtubules.
3. Asters are mainly involved in providing support to the chromosomes and guides chromosomes to be placed at the right position in the nuclear envelope.
4. Centrosomes develop prior to the development of asters and these are cytoskeleton structures made up of two centrioles, or bundles of microtubules, that are adhered to one another at a right angle and typically remain close to the nuclear envelope of the cell.
5. The centrosome splits into two daughter centrosomes just before mitosis or meiosis starts, and each centrosome moves to the opposing side of the nucleus.
6. Centrosomes build two new structures as mitosis or meiosis starts:

• Sister centrosomes are connected to one another by spindle fibres.
• aster-like structures that emerge from the centrosome.

Explanation for Incorrect option:

Option A:

The ribosome acts as a protein factory in the cell that helps in the production of proteins and amino acids.

Option B:

Excess or worn-out cell parts are broken down by lysosome and they could be utilized to kill viruses and bacteria that have infiltrated the system.

Option D:

1. A chromosome is a DNA molecule that consists of a part or all of the genetic material of an organism.
2. The chromosome is present in the nucleus of each cell, and it is packaged into thread-like structures.

Final answer: Centrosomes are responsible for the formation of aster in the cell division.