In DNA, how many hydrogen bonds form between guanine and cytosine?

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All right. Hello everyone. So this question is asking us in a DNA molecule, adenine pairs with which base and how many hydrogen bonds are formed between them. So here, let's recall the principles of base pairing, right? In a DNA molecule, we have four distinct nitrogenous bases making up DNA nucleotides. So here the complementary bases of two different strands are going to hydrogen bond together to hold the double helix together. So here, Adenine pairs with thymine. So that's A to T and vice versa. While cytosine pairs with guanine and vice versa. So C with G and G with C. So here, right, the complementary interactions or rather the hydrogen bonds between these complementary bases are once again, what stabilize the double helix strands of DNA. So both or rather the hydrogen bond, the interaction rather between adenine and thymine is composed of two hydrogen bonds. And this is because of the structure of both bases, cytosine and guanine. On the other hand, are held together by three hydrogen bonds. And so because C and G are held together by three H bonds, as opposed to two, it's said that DNA molecules with more bonds between cytosine and guanine and again, vice versa, are said to be more stable. So from there, we can summarize our final answer. Adenine is going to pair with thymine and that interaction is stabilized by two hydrogen bonds between them. And so there you have it. And with that being said, thank you so very much for watching and I hope you found this helpful.

In DNA, how many hydrogen bonds form between guanine and cytosine?

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Key Concepts

Hydrogen Bonds in DNA

Base Pairing Rules

Structure of DNA