Introduction to DNA ( D eoxyribo n ucleic a cid). What do you know?. Scientists. Phoebus Levene. 1920 – Determined the basic structure of nucleotides that make up DNA 5-carbon sugar, phosphate group, and a nitrogenous base. Erwin Chargaff. 1952 - Nitrogenous base composition
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1. DNAhelicaseunzips the original DNA molecules by severing hydrogen bonds between nucleotides
2. New nucleotides are added to the template strands using DNA polymeraseenzymes(complementary base pairing)
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