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Why do nucleotides only pair with certain other nucleotides?

User Gabssnake
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2 Answers

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18 votes
Molecular structure. It is like liquids, and they only mix if the have the same things but nucleotides do the same thing.
User Greg Parker
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Answer: Molecular structures

Explanation:

In DNA ladders, each rung is actually two bases, but each pair is paired with only one other base because of their molecular structure.

Hope this helps you.

User Oktapodia
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