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The two strands of DNA that make up the double helix are connected by hydrogen bonds between the base pairs. For DNA to replicate, it must continuously zip and unzip the two strands. If those strands were held together by anything stronger than a hydrogen bond (say covalent bonds), it would require too much energy to unzip them and DNA would not be able to replicate. Were they to be held together by anything weaker dipole-dipole or dispersion forces), they probably would not stay together at all.

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15y ago
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11y ago

DNA is double stranded. The two complementary strands are held together by hydrogen bonds. These hydrogen bonds are strong enough to hold the molecule together, but weak enough to be unzipped when during DNA replication. This process requires enzymes, but in the end, it produces two identical strands of DNA from one.

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11y ago

Hydrogen bonds are individually weak, but many of them form. Collectively, they are strong enough to stabilize the structures of large biological molecules such as DNA.

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12y ago

well they are weak bonds - easier to break so DNA replication is easier whereas if they were covalent bonds DNA replication would not be possible

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12y ago

hydrogen bonding play a very important role in DNA structure because it hold two strands of DNA together

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11y ago

To pair base structures

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Q: What is the role of hydrogen bonds in DNA?
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