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Two arms composed mainly of DNA and held together by centromere is

  • A.Gene
  • B.Cell
  • C.Protein
  • D.Chromosome

Answer: D

A chromosome consists of two arms (chromatids) made mainly of DNA and joined at the centromere. A gene is only a short stretch of DNA on a chromosome, a cell is the whole structural unit that contains the chromosomes, and a protein is a different kind of molecule. Hence the structure described is a chromosome.

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