Final answer:
Chromosomes and chromatin are the two forms DNA takes in a cell, with chromosomes forming during cell division and chromatin existing when the cell is not replicating.
Explanation:
Chromosomes are structures that DNA organizes into during cell division, while chromatin is the form DNA takes when the cell is not dividing, existing as a grainy material in the nucleus. Chromosomes consist of two sister chromatids held together at a centromere.
Learn more about DNA organization in cells here:
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