Please don't copy Chemistry All of the following tend to favor a helical conformation of a single polynucleotide chain EXCEPT: Group of answer choices A. hydrophobic interactions of the rings of the purine and pyrimidine bases that exclude water. B. charge–charge repulsion of phosphate residues of the polynucleotide backbone. C. hydrogen bonding between appropriate purine–pyrimidine pairs. D. interchange of electrons in the p orbitals of the purine and pyrimidine bases.

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