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Why is a DNA molecule called a double helix? A. Each nucleotide has two main parts: a base and a phosphate. B. The sugar and phosphate parts are the same in all DNA molecules. C. There are two kinds of
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Why is a DNA molecule called a double helix?

A. Each nucleotide has two main parts: a base and a phosphate.
B. The sugar and phosphate parts are the same in all DNA molecules.
C. There are two kinds of nitrogen bases in a DNA molecule.
D. A DNA molecule always has two strands of nucleotides.

User Christeen
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B. the sugar and phosphate
User New
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