Non-coding DNA

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  • Non-coding DNA
    • in eukaryotes, a lot of nuclear DNA doesn't code for poypeptides
    • genes that do code for polypeptides contain sections that do not code for amino acids
      • called introns
        • can be several within gene & their purpose isn't known for sure
        • in eukaryotes - removed during protein synthesis
          • so they do not affect amino acid order
        • prokaryotic DNA do not have introns
    • all the bits of a gene that do code for amino acids - exons
    • eukaryotic DNA contains regions of multiple repeats outside of genes
      • DNA sequences that repeat over and over
        • don't code for amino acids
          • non-coding multiple repeats


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