At the beginning of nuclear division, the number of microtubule triplets in two pairs of centrioles that migrate to opposite poles are:
Correct answer: D. 36
- A. 9
- B. 18
- C. 108
- D. 36
Explanation
Structure of a Centriole:Each centriole is composed of 9 microtubule triplets arranged in a cylindrical structure, forming the 9+0 arrangement.Centrioles in the Centrosome:Each centrosome contains a pair of centrioles (two centrioles).Since the cell contains two centrosomes during nuclear division (one for each pole), there are a total of 4 centrioles.Number of Microtubule Triplets:Each centriole has 9 triplets, so the total number of triplets in 4 centrioles is: 36
This question appeared on the UHS MDCAT 2015 paper, which you can sit online with every answer explained.
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Cytoplasmic organelles are the specialized structures suspended in cytoplasm, including mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles and centrosomes. Questions compare their structures and functions in animal and plant cells, including chloroplasts and the role of the endomembrane system in transport and secretion.
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