Watson and Crick discovered that DNA had two sides, or strands, and that these strands were twisted together like a twisted ladder -- the double helix. The sides of the ladder comprise the sugar-phosphate portions of adjacent nucleotides bonded together.The phosphate of one nucleotide is covalently bound (a bond in which one or more pairs of electrons are shared by two atoms) to the sugar of the next nucleotide.ach nucleotide consists of a sugar (deoxyribose) bound on one side to a phosphate group and bound on the other side to a nitrogenous base. There are two classes of nitrogen bases called purines (double-ringed structures) and pyrimidines (single-ringed structures). The four bases in DNA's alphabet are:
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Robert Frosts Fire And Ice Poems English Literature Essay. Published: 23rd March, 2015 Last Edited: 23rd March, 2015. This essay has been submitted by a student. This is not an example of the work written by our professional essay writers. The poem Fire and Ice by Robert Frost is one that deals with the age-old topic of how the world will end.