DNA: Deoxyribonucleic Acid (Structure)
The structure of DNA is described as a double helix. Imagine a ladder that is twisted;
that's a double helix. Each side of the ladder is built of millions of ester
linkages between 5-carbon sugar rings and their attached phosphate groups. The steps
of the ladder are actually in two pieces, attached by a hydrogen bond; one piece is a
nitrogenous base, and the other piece is the pair of that base. In this ladder,
adenine always pairs with thymine, and cytosine always pairs with guanine.
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