Which statement helps to explain why the two sugar-phosphate chains in a DNA molecule are a constant distance apart?
1 )
Adenine and thymine are held together by the same number of hydrogen bonds as cytosine and guanine.
2 )
Each nucleotide molecule is the same size.
Each purine base is linked to a pyrimidine base.
4 )
The sugar-phosphate strands of the helix are held together by sulfur bridges.
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