Final answer:
Chromosomes in the nucleus of eukaryotic cells contain DNA molecules organized into chromatin bundles.
Explanation:
Chromosomes are thread-like structures in the nucleus of eukaryotic cells that contain DNA molecules. These DNA molecules are organized into bundles called chromatin, consisting of DNA and proteins such as histones. Before cell division, chromosomes are duplicated through DNA replication, ensuring each daughter cell receives a complete set of chromosomes.
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