Area where the chromatids of a chromosome are attached.

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Multiple Choice

Area where the chromatids of a chromosome are attached.

Explanation:
The key idea is the region where sister chromatids stay stuck together. After DNA is replicated, a chromosome has two sister chromatids joined at this region. This constricted area, the centromere, also becomes the attachment site for the kinetochores that spindle fibers grab onto to pull the chromatids apart during cell division. In contrast, telomeres cap the ends of chromosomes, centrioles help organize the spindle, and mitochondria provide energy. So the centromere is the specific site where the chromatids are held together and then separated later in mitosis.

The key idea is the region where sister chromatids stay stuck together. After DNA is replicated, a chromosome has two sister chromatids joined at this region. This constricted area, the centromere, also becomes the attachment site for the kinetochores that spindle fibers grab onto to pull the chromatids apart during cell division. In contrast, telomeres cap the ends of chromosomes, centrioles help organize the spindle, and mitochondria provide energy. So the centromere is the specific site where the chromatids are held together and then separated later in mitosis.

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