Which of the following best defines the term nucleic acid backbone?a. Nucleic acids are composed of a backbone of nitrogen bases and sugar molecules. The phosphate groups are attached to nitrogen bases.b. Nucleic acids are composed of a backbone of nitrogen bases and phosphate groups. Sugars are attached to nitrogen bases but not to phosphate groups.c. Nucleic acids are composed of a backbone of nitrogen bases and phosphate groups. Sugars are attached to phosphate groups but not to nitrogen bases.d. Nucleic acids are composed of a backbone of sugar molecules and phosphate groups. The nitrogen bases are attached to the sugars.

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