5003 DNA-A Set 5004 DNA-B Set
5005 DNA-Z Set 5008 Double Helices RNA
5009 Triple Helices DNA
Page 7

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7) Direction of Polynucleotide Chain Attach Phosphate group Deoxyribose to A-T, G-C pairs in the method and procedure described in Sect-6.5. Note that the direction of the Polynucleotide should be opposite at sides, left and right. 7.1 Prepare 2 sets of phosphate groups attached with deoxyribose. Attach them to A-T and G-C Pairs respectively. When one side of phosphate group attached to 05�Œpoints upwards, the other side will point downwards. This means that when the above set is turned over 180 around Center, the phosphate group and deoxyribose at left and at right will superimpose completely (Fig-26). 7.2 For Triple Helices DNA, the polynucleotide chain direction is different from the Doubie Helices RNA, since the Triple Helices DNA has 3 chains. Basically, consider the center chain of the three as a standard. One chain will point in the opposite direction and other will point in same direction with the center chain. 7.3 When the chain of polynucleotide is completed, it is important that you place the model upside down and confirm that the conformation is the same as described in the above Sect-7.1. Lastly, check if all the bond portions are secured firmly. If not, fit them together with fingers from both sides to ensure that all the portions are held together firmly. Fig. 26
Fig. 27	A transparent plastic case cover is available upon order for the completed model for display etc. (Knocked down supply) Fig. 28
Bio-751 Case Cover A-DNA Bio-752 Case Cover B-DNA, Double helices RNA Bio-753 Case Cover Z-DNA, Triple helices DNA

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