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Question 1 of 15
Which of the following describes the structure of DNA?
A. A single strand with nitrogenous bases on the outside and a sugar-phosphate backbone on the inside.
B. A double helix with nitrogenous bases on the outside and a sugar-phosphate backbone on the inside.
C. A double helix with a sugar-phosphate backbone on the outside and nitrogenous bases on the inside.
D. A single strand with a sugar-phosphate backbone and nitrogenous bases on the outside.