Double your dating 1

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Both chains are coiled round the same axis, and have the same pitch of 34 ångströms (3.4 nanometres).The pair of chains has a radius of 10 ångströms (1.0 nanometre).Each nucleotide is composed of one of four nitrogen-containing nucleobases (cytosine [C], guanine [G], adenine [A] or thymine [T]), a sugar called deoxyribose, and a phosphate group.The nucleotides are joined to one another in a chain by covalent bonds between the sugar of one nucleotide and the phosphate of the next, resulting in an alternating sugar-phosphate backbone.

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In contrast prokaryotes (bacteria and archaea) store their DNA only in the cytoplasm.DNA) is a thread-like chain of nucleotides carrying the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses.DNA and ribonucleic acid (RNA) are nucleic acids; alongside proteins, lipids and complex carbohydrates (polysaccharides), they are one of the four major types of macromolecules that are essential for all known forms of life.In a DNA molecule, the pyrimidines are thymine and cytosine, the purines are adenine and guanine. The DNA backbone is resistant to cleavage, and both strands of the double-stranded structure store the same biological information.This information is replicated as and when the two strands separate.

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