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13 July, 10:37

Why is a DNA molecule called a double helix?

A. A DNA molecule always has two strands of nucleotides.

B. Each nucleotide has two main parts: a base and a phosphate.

C. The sugar and phosphate parts are the same in all DNA molecules.

D. There are two kinds of nitrogen bases in a DNA molecule.

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Answers (1)
  1. 13 July, 11:48
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    A

    Explanation:

    Because there are two DNA strands in the DNA molecule and they both rotate around each other in a helix formation. So two helixes = double helix.
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