DNA model and a genetic sequence. Computer screen with a graphical display of the genetic sequence of DNA (deoxyribonucleic acid). Chromatographical analysis of DNA allows scientists to analyse genes (regions) of DNA for traits and defects. In front of the screen is a model of DNA, which comprises two spiralling paired strands of sugar phosphates that are linked by four nucleotide base pairs, which form the struts of the DNA molecule. The arrangement of the bases along a helix of DNA is the genetic code for protein synthesis and the functioning & growth of every living organism. DNA is found in cell nuclei.
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