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A quadruple bond is a type of chemical bond between two atoms involving eight electronsThis bond is an extension of the more familiar types double bonds and triple bonds. Stable quadruple bonds are most common among the transition metals in the middle of the d-block such as rhenium tungsten technetium molybdenum and chromiumTypically the ligands that support. Taiwan Booklet Country Study Project Unit Country Studies Country Study Project Kindergarten Special Education Some DNA-binding domains may also include nucleic acids in their folded structure. . A DNA-binding domain DBD is an independently folded protein domain that contains at least one structural motif that recognizes double- or single-stranded DNAA DBD can recognize a specific DNA sequence a recognition sequence or have a general affinity to DNA.