cell is engaged in metabolic activity and performing its prepare for mitosis (the next four phases that lead up to and include nuclear division).
Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible.
may contain a pair of centrioles (or microtubule organizing centers in plants) both of which are organizational sites for microtubules.
Chromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes.
entrioles begin moving to opposite ends of the cell and fibers extend from the centromeres.
nuclear membrane dissolves, marking the beginning of prometaphase.
Proteins attach to the centromeres creating the kinetochores. Microtubules attach at the kinetochores and the chromosomes begin moving.
Spindle fibers align the chromosomes along the middle of the cell nucleus.
line is referred to as the metaphase plate.
organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome.
paired chromosomes separate at the kinetochores and move to opposite sides of the cell.
results from a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules.
Chromatids arrive at opposite poles of cell, and new membranes form around the daughter nuclei.
chromosomes disperse and are no longer visible under the light microscope
pindle fibers disperse, and cytokinesis or the partitioning of the cell may also begin during this stage.
cytokinesis results when a fiber ring composed of a protein called actin around the center of the cell contracts pinching the cell into two daughter cells, each with one nucleus.
rigid wall requires that a cell plate be synthesized between the two daughter cells.
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