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What is Forms of DNA Double Helices?

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• It has been established that DNA molecules can assume different

conformational forms depending on its nucleotide sequence. The

description of the DNA double helix in previous sections relates to the

B-form of DNA which has right handed coiling, and has 10.4 base

pairs per turn of the helix.

• In addition to the B-form, several other DNA forms have been

discovered, e.g., A-DNA, C-DNA and Z-DNA; these DNA forms differ in

several respects, such as, number of base pairs per turn and spacing

of nucleotides along the helical axis. Some of the crystallographic

characteristics of the different forms of DNA are being described.

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