Centrioles are made up of _ microtubules:
Correct answer: B. 27
- A. 9
- B. 27
- C. 3
- D. 12
Explanation
Centrioles are key cellular structures involved in cell division, found in animal cells. Structurally, each centriole is made up of nine sets of microtubule triplets, arranged in a cylindrical form. Each triplet contains three microtubules, so when you multiply the nine triplets by the three microtubules per triplet, you get a total of 27 microtubules forming the centriole. Therefore, Option B (27) is the correct answer. Option A (9) incorrectly considers only the number of triplet groups, Option C (3) focuses on the individual microtubules within a triplet rather than the entire structure, and Option D (12) is unrelated to the microtubule count in centrioles.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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