Question

Whether division of cell organelles occur during cell division

Answer 1

ER is manufactured by the nuclear membrane. During cell division the nuclear membrane disappears (or stretches beyond visibility), and the ER membrane is generally not visible, but the ribosomes are still there in their free form. I imagine when 2 new cells are formed, ER membrane once again arises from the nuclear membrane and "collects" free ribosomes to re-form new ER. I seem to recall that another membranous organelle, the Golgi apparatus, also "disappears"; however, the double-membraned mitochondria will remain in the cell(s) throughout the various stages of mitosis, most likely to provide the energy required for cell division.

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