Which of the following structure is present in both plant and animal cells but is absent in prokaryotic cells?
Correct answer: B. Microtubules
- A. Centrioles
- B. Microtubules
- C. Plastids
- D. Sieve tubes
Explanation
Microtubules are cytoskeletal elements that are found in all eukaryotic cells, including both plant and animal cells, but are absent in prokaryotic cells. They play essential roles in maintaining cell shape, enabling intracellular transport, and facilitating cell division. In contrast, centrioles are not present in higher plant cells, plastids are exclusive to plant cells, and sieve tubes are specialized structures found only in the phloem of plant cells. Therefore, the correct answer is microtubules.
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About Cell Structure and Function
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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