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**Deposition of DNA Rafts on Mica and Resulting Polymerization ** **Abstract ** DNA rafts, and particularly their self-assembly, have many uses in the creation of scaffolding in circuit boards for nanotechnology. The question explored was what mode of polymerization the DNA rafts adhered to. Step-polymerization has components that have an equal chance of reacting, while chain-growth polymerization builds a polymer from one active site.9 Samples were created from the deposition of DNA rafts (a double-crossover molecule made of 4 DNA tiles of double-stranded DNA) on mica, along with a Mg2+/TAE (1x) buffer. Several trials were conducted to find a concentration of DNA that produced less crowded images of DNA rafts. Once that was accomplished, the particles on the surface were identified as DNA rafts and were analyzed to find their mode of polymerization. Using the modified Carothers Equation and Polydispersity Index (PDI) to analyze the results of the DNA polymerization yielded signs of step-growth polymerization and not chain-growth polymerization. The analysis also indicated the presence of defective rafts.  