The strands of a DNA molecule are held together by hydrogen bonding between_______
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The strands of a DNA molecule are held together by hydrogen bonding between_______

[From: ] [author: ] [Date: 11-12-07] [Hit: ]
the strands of DNA molecule are held together by hydrogen bonding between Adenine with Thymine and Guanine with Cytosine.Cyosine and thymine (and uracil) are pyrimidins.......
The original question was.... "the strands of DNA molecule are held together by hydrogen bonding between adenine with guanine molecules and cytosine with thymine molecules." But i know that isn't right. I know that the the strands of DNA molecule are held together by hydrogen bonding but i don't know between what tho. AN i have looked all over the web. help PLEASE..!!!

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The hydrogen bonds occur between adenine and thymine and between cytosine and guanine.
A-T
C-G
Andenine and guanine are both purines so they don't form H-bonds
Cytosine and thymine are both pyrimadines, so they dont form H-bonds

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"DNA nucleotides are joined together by hydrogen bonds at the bases. The two strands wind up to form the DNA double helix

3 hydrogen bonds between Guanine and Cytosine
2 hydrogen bonds between Adenine and Thymine

Adenine always pairs with Thymine while Guanine always pairs with Cytosine. This is called Chargaff's rules. There are 3 hydrogen bonds between C and G while there are only 2 hydrogen bonds between A and T. Therefore the bonds between the C ad G are stronger"

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Of course that's not right, the strands of DNA molecule are held together by hydrogen bonding between Adenine with Thymine and Guanine with Cytosine. (A-T; G-C)

Adenine and guanine are purins
Cyosine and thymine (and uracil) are pyrimidins.
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