CELL STRUCTURES AND FUNCTION
CELL DIVISION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Chromosomes get duplicated
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Nucleus and nucleolus disappear
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Centrioles occupy opposite poles of the cell
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Spindle fibers appear
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Chromosomes get attached to the spindle fibers via centromere
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Detailed explanation-1: -In prophase of mitosis, specialized regions on centromeres called kinetochores attach chromosomes to spindle fibers. The centromere is the part of a chromosome that links sister chromatids. During mitosis, spindle fibers attach to the centromere via the kinetochore.
Detailed explanation-2: -Acentric are the chromosome which does not have centromere as acentric chromosome do not have the centromere they lack the point where spindle fiber attach. Hence they do not provide the attachment site for spindle fibers.
Detailed explanation-3: -Which is NOT associated with prophase? The nucleus reforms.
Detailed explanation-4: -Metaphase. During metaphase, spindle fibers attach to the centromere of each pair of sister chromatids (see Figure below). The sister chromatids line up at the equator, or center, of the cell. This is also known as the metaphase plate.