3.	DNA is considered to be the building block of life on Earth. Describe the biochemical composition of DNA, its structure, and its replication as it occurs in Escherichia coli. E. coli is a also considered to be the “workhorse” of modern molecular genetics. In fact, recombinant DNA technology using this organism enables the treatment of diabetes with recombinant human insulin made in E. coli. Explain the process of constructing recombinant DNA in E. coli and how this is used to produce human insulin. 
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