Z-DNA (deoxyribonucleic acid), molecular model. DNA is composed of two strands twisted into a double helix. Each strand consists of a sugar-phosphate

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Z-DNA (deoxyribonucleic acid), molecular model. DNA is composed of two strands twisted into a double helix. Each strand consists of a sugar-phosphate backbone attached to nucleotide bases. There are four bases: adenine, cytosine, guanine and thymine. The bases are joined together by hydrogen bonds. The Z form is one of the many possible structures of the DNA double helix. It winds to the left in a zig-zag pattern as opposed to the more common right-handed B-DNA.

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