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Watson-Crick bonds guanine-cytosine and adenine-thymine helically shape DNA. If I understand correctly, a sequence in only two of the nucleotides, for instance TGGTGTGGGTG ... would determine the dual side (ACCACACCCAC...), because the only possible bonds are TA, and GC.

I am interested in knowing if there exist double bonds in useful biomolecules. Precisely, I'd be interested in knowing if there exist a useful double bond present in chains of (something like) nucleotides.

Thank you in advance.

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Hydrogen bonding gives rise to the tertiary structure of a biopolymer. You can learn more about the many shapes and structures of nucleic acids here: https://en.wikipedia.org/wiki/Nucleic_acid_tertiary_structure

Proteins are the most structurally diverse biopolymers, and they assume very complex and dynamic shapes: https://en.wikipedia.org/wiki/Protein_structure

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