Final answer:
Prophase is the initial and lengthiest phase of mitosis, involving chromatin condensation into chromosomes, nucleolus disappearance, nuclear envelope breakdown, and centriole movement to cell poles.
Explanation:
Prophase is the first and longest phase of mitosis. It is characterized by the condensation of chromatin into visible chromosomes, the disappearance of the nucleolus and nuclear envelope, and the movement of centrioles to opposite poles of the cell. Additionally, the spindle apparatus, composed of microtubules, begins to form during prophase.
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