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A centromere is: A. Composed of a ring of microtubules; they occur in pairs, making up the centrosome. B. Composed of microtubules wrapped in an extension of the plasma membrane; they can bend, are important for propulsion, and may be found on the cell surface. C. A microtubule-organizing region out of which microtubules grow; it's composed of a pair of centrioles. D. The region of a duplicated chromosome where two sister chromatids are joined and where spindle microtubules attach during mitosis and meiosis.
Sagot :
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