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What is the basic unit that is put together over and over to build a strand of dna?

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The basic units that are put together over and over to build a strand of dna are called as nucleotides.

Step-by-step explanation:

DNA is a heteropolymer that involves many monomers that is the nucleotides that are joined together by phosphodiester bonds in order to develop a complete DNA. The nucleotides consists of nitrogenous bases, phosphate groups and the sugar molecules that are bound together to form a complete nucleotide. The phosphate groups form a backbone through which the nucleotides are joined together.

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