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DNA - PowerPoint PPT Presentation


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DNA. DNA is a molecule that is a double helix.A double helix is two strands twisted around each other, like a winding staircase.Each strand of the double helix is made of linked nucleotides.. Nucleotides . Nucleotides are the subunits that make up DNA.Each nucleotide is made up of three parts: A phosphate groupA five-carbon sugar moleculeA nitrogen-containing base.

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