DNA is twisted into a ____ shape. DNA is made up of subunits called ____. Each one is made up of a pentose sugar, a ____ group, and a nitrogenous ____ .There are four different bases - ____ , thymine, cytosine and guanine - that bond together in a specific pairs. Adenine always bonds with ____ and ____ always pairs with guanine. These bases are bonded together by weak ____ bonds.

DNA Structure Missing Text

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