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Sagot :
Every chromosome contains a single long DNA molecule and not 2 DNA molecules in a single chromosome.
Chromosome is the highly packed form of DNA. It is comprised of DNA and the histone proteins. The histone proteins play a major role in the formation of chromosome. Each chromosome has two equal copies called sister chromatids that are attached together at the centromere. The ends of sister chromatids are called telomeres.
DNA is the nucleic acid that serves as the genetic material for maximum of the organisms. It is a double stranded helical structure where the strands run in anti-parallel direction. The two strands are joined together by hydrogen between the bases. The nitrogenous bases contained in DNA are: adenine, guanine, cytosine and thymine.
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