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the two strands of DNA are joined to each other or held together by

the two strands of DNA are joined to each other or held together by

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The two strands of DNA are held together by hydrogen bonds

DNA consists of two strands made up of molecules called nucleotides. The two strands are antiparallel and the nucleotides are complementary. The strands are held together with the help of hydrogen bonds between nucleotides. These nucleotides may be purines (Adenine and Guanine) or pyrimidine (Thymine and Cytosine). Adenine pairs with thymine in the opposite strand with 2 hydrogen bonds whereas guanine pairs with cytosine with 3 hydrogen bonds. As GC contains 3 bonds, it is naturally stronger than AT bonding. All the bonds are shown in the figure below.

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