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TarikAziz

Answer:

A sugar-phosphate-sugar chain.

Explanation:

A sugar-phosphate-sugar chain forms the "backbone" of DNA. Nitrogenous bases are faced inside. Within a polynucleotide chain, the two nucleotides linked together by a bond, which is called a phosphodiester bond. In nucleotide, phosphoric acid and pentose sugar( deoxyribose) are bonded with phosphoester bond. And pentose sugar and nitrogenous bases are bonded with the N-Glycosidic bond. The two strands of DNA are held together by Hydrogen bonds, which present between nitrogenous bases of the opposing strand.

Answer:

sugar-phosphate backbone

Explanation:

A sugar-phosphate backbone (alternating grey-dark grey) joins together nucleotides in a DNA sequence. The sugar-phosphate backbone forms the structural framework of nucleic acids, including DNA and RNA. This backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

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