Multiple choice

Thread like structures that start to appear from each centromere by the end of prophase are

  1. kinetochore microtubules

  2. polar microtubules

  3. aster microtubules

  4. spindle microtubules

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A Correct answer
Explanation

The kinetochore is the protein structure on chromatids, where the spindle fibers attach during cell division to pull sister chromatids apart. The kinetochore forms in eukaryotes, assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis.