During cell division, which structure copies DNA before division?

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Multiple Choice

During cell division, which structure copies DNA before division?

Explanation:
DNA is copied during the S phase inside the nucleus, where the cell’s chromosomes are housed and the replication machinery can access the genetic material. Copying the entire genome in the nucleus ensures there are two identical sets of DNA that can be distributed equally during mitosis. The other structures listed aren’t where the full genome replication for cell division occurs: mitochondria do have their own DNA and replicate, but not to prepare the cell’s chromosomes for division; the cytoplasm and the endoplasmic reticulum are not sites of DNA copying. So the nucleus is the correct place for copying DNA before division.

DNA is copied during the S phase inside the nucleus, where the cell’s chromosomes are housed and the replication machinery can access the genetic material. Copying the entire genome in the nucleus ensures there are two identical sets of DNA that can be distributed equally during mitosis. The other structures listed aren’t where the full genome replication for cell division occurs: mitochondria do have their own DNA and replicate, but not to prepare the cell’s chromosomes for division; the cytoplasm and the endoplasmic reticulum are not sites of DNA copying. So the nucleus is the correct place for copying DNA before division.

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