During the metaphase stage of mitosis, spindle fibers attach to chromosomes at:
Correct answer: A. Kinetochore
- A. Kinetochore
- B. Both centromere and kinetochore
- C. Centromere, kinetochore and areas adjoining centromere
- D. Centromere
Explanation
In metaphase, chromosomes consisting of two sister chromatids get arranged at the equator. Discontinuous fibers radiate out from two spindle poles and get connected to the disc-shaped structure at the surface of the centromere called kinetochores. These are known as chromosome fibers or tactile fibrils. A kinetochore is a complex protein structure that is analogous to a ring for the microtubule hook; it is the point where microtubules attach themselves to the chromosome.
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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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