QA.29. The centrosome is
responsible for:
A. Cell wall formation
B. Cell plate formation
C. Initiation of cell division
D. Inhibition of cell division
Answers
Answer:
Explanation:
After a brief look at the stages of mitotic cell division, let’s understand in what way centrosomes are essential for successful cell division by mitosis.
Every species is defined by a chromosome number that is constant for the species. For example, the human cell has 23 pairs or 46 chromosomes. During the S-phase of mitotic cell division, each chromosome splits into two sister chromatids. To ensure the continuity of species, it is essential that the chromosome number in each daughter cell is the same as that in the mother cell. The function of centrosome, during cell division, is to maintain the chromosome number. Replication of DNA during cell division is accompanied by the splitting of the centrosome into two, each having one centriole. The two centrosomes attach themselves to the opposite poles of the nucleus. Once the nuclear membrane dissolves, they form spindles, connected to each other by the formation of spindle fibers between them. After the splitting of each chromosome into two sister chromatids, one chromatid from each pair gets associated with the north pole, while the moves towards the south pole of the nucleus. At the final stage of mitotic cell division, two daughter cells are formed from each mother cell, and each of the centrosomes of the mother cell becomes the nucleus of the daughter cells.
Answer:
d) inhibition of cell division
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