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25 February, 11:12

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.

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Answers (1)
  1. 25 February, 13:32
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    B. the sugar and phosphate
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