Short fibers of mitotic apparatus radiating from the centrioles only at poles are called:
Correct answer: D. Astral fibres
- A. Continuous spindle fibres
- B. Long spindle fibres
- C. Half spindle fibres
- D. Astral fibres
- E. Discontinuous spindle fibres
Explanation
Astral fibers, also known as astral microtubules, are a type of microtubule involved in cell division, particularly in mitosis and meiosis. Astral microtubules are an essential component of the mitotic spindle, a structure that helps ensure the accurate separation and distribution of chromosomes during cell division. Astral microtubules extend from the centrosomes (microtubule organizing centers) at one or both poles of the cell to the cell's periphery, reaching toward the cell membrane or cortex. They help to position the mitotic spindle and guide chromosome segregation.
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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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