One of the basic questions usually asked by students in biotechnology class is about how DNA is made and this biotechnology definition faces them with philosophy of biology science and genetic engineering because now we can change chains of nucleotides for a special purpose.

DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.

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