DNA is a ____ consisting of repeating units of ____ units called ____. The nucleotides consist of ____ sugar, ____ molecule and a ____ base (A, T, C, G). The phosphate is ____ bonded to the deoxyribose sugar on C5 or ____ this bond is called a ____ bond. The base is bonded on C1 by a ____ bond. There are 2 types of nitrogenous bases, purines and ____. Adenine and guanine are 2 ring structures and are ____. Thymine and cytosine are ____ ring structures and are pyrimidines. Purine and pyrimidines ALWAYS ____. Adenine and thymine always pair by means of ____ hydrogen bonds. Guanine and cytosine always pair up by means ____ ____ bonds. The phosphate and the deoxyribose sugar form the sugar-phosphate ____, there are 2 strand running in the opposite direction, we call this ____. This refers to the direction that the ____ and 5th carbon molecules on deoxyribose are facing. The 5’ end is where phosphate group is attached to the ____ carbon atom of the ____. The 3’ end is where the ____ group is attached to the 3rd carbon atom of the deoxyribose. The 2 ____ will twist into a ____ helix.

DNA structure

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