Why are hydrogen bonds weak in DNA?
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Hydrogen bonds do not involve the exchange or sharing of electrons like covalent and ionic bonds. The weak attraction is like that between the opposite poles of a magnet. Hydrogen bonds occur over short distances and can be easily formed and broken.
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Weak bonds may be easily broken but they are very important because they help to determine and stabilize the shapes of biological molecules. For example, they are important in stabilizing the secondary structure (alpha helix and beta-pleated sheet) of proteins. Hydrogen bonds keep complementary strands of DNA together.
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