the backbone of the DNA molecule is formed by
1. nitrogen bases
2. nitrogen base pairs
3. sugar-phosphate -sugar chain
4. sugar-nitrogen base
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Explanation:
I think option 2
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Answer:
3. sugar-phosphate -sugar chain
Explanation:
DNA consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases--adenine (A), cytosine (C), guanine (G), or thymine (T).
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