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The sides of the DNA strand is made up of a sugar phosphate backbone. The sugar in DNA is deoxyribose (in RNA it is ribose) and in the nucleotide monomer it is attached to a phosphate group on the 5' carbon of the sugar. The monomers are attached together by the biochemical reaction of dehydration synthesis to form a nucleic acid chain of many millions of nucleotides by attaching the phosphate group of one nucleotide to the 3' carbon of the deoxyribose of another carbon.

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Dr. Claire

DNA Diva

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13y ago
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12y ago

the sides of a double helix are composed of a chain alternating between a phosphate and a deoxyribose (5 carbon) sugar.

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10y ago

Each nucleotide has nitrogen sugar, a hydrogen bond, and on the sides a phosphate and a deoxyribose sugar

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15y ago

The centre of the double helix is made of the hydrogen-bonded pairs of DNA bases.

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13y ago

Cytosine, Guanine, Thymine, and Admine. They are combined by a weak hydrogen bond.

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14y ago

The Nitrogenous bases

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13y ago

i think the backbone.

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Q: What makes up the middle of DNA double helix?
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