Which of the following statements about water is NOT true? A. It helps to maintain a normal body temperature.
B. It is a good source of energy.
C. It carries substances throughout the body in the bloodstream.
D. It is needed for all chemical reactions to occur.

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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