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Which of the following statements about DNA are true? (1) The DNA double helix consists of two polynucleotide chains. (2) Each DNA nucleotide consists of a sugar, a phosphate group, and a nitrogen-containing base. (3) The DNA backbone is composed of the sugar and base of each nucleotide.

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Which of the following statements about DNA are true? (1) The DNA double helix consists of two polynucleotide chains. (2) Each DNA nucleotide consists of a sugar, a phosphate group, and a nitrogen-containing base. (3) The DNA backbone is composed of the sugar and base of each nucleotide.






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