DNA is a chemical that makes us all ____ different. DNA is made up of ____ strands of ____ made up of repeating units called ____. Each nucleotide consists of ____ parts. A phosphate group (represented by a ____), a deoxyribose sugar (represented by a ____) and a nitrogenous base (represented by a ____). Nucleotides join together during a ____ reaction to form the phosphate - sugar ____. The two strands of nucleic acid run ____ and are held together by ____ bonds between the ____ bases on each strand. The bases pair in a particular manner called ____ base pairing. A always joins with T and C always joins with ____. the discovery of DNA is attributed to Watson and ____, ____ and Wilkins and ____. Watson and crick built the first ____ of DNA in the 1950's having used the work of ____ Franklin without her knowledge.

Structure of DNA

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