A) kinetochore microtubules
B) polar microtubules
C) aster microtubule
D) spindle microtubules
Correct Answer: A
Solution :
Prometaphase is the phase of mitosis following prophase and preceding metaphase. In prometaphase, the spindle enters the nuclear area. Specialized structures called kinetochores have formed on the centromeres of the chromosomes by this time; certain spindle microtubules, the kinetochore microtubules attach to the kinetochores.
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