One of the usually paired and parallel strands of a duplicated chromosome joined by a single centromere is the definition of a

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The definition provided in the question is that of a chromatid, which is a replicated chromosome consisting of two identical strands (chromatids) joined together by a single centromere. A nucleolus is a distinct structure found within the nucleus of a cell involved in the production of ribosomal RNA, and is not related to duplicated chromosomes. Polymer and macromolecule refer to larger molecules composed of repeating subunits, and do not relate to duplicated chromosomes or their structure.

One of the Usually Paired and Parallel Strands of a Duplicated