i hope this will help.
http://ircamera.as.arizona.edu/Astr2016/text/nucleicacid1.htm
3.Are the bases on the interior or the exterior of the double helix? Are they randomly arranged or neatly stacked?
2.Are the phosphate groups on the interior or the exterior of the DNA molecule?
3.Are the sugar groups on the interior or the exterior of the DNA molecule?
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