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Question: the molecule above is called a purine and is an...

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The molecule above is called a purine and is an important moiety in DNA and RNA nucleotides. The pKa of the protonated nitrogen is 8.7. How many of the purine nitrogens can act as hydrogen bond donors at pH 6.7? How many at pH 10.7? 1 H-bond donor at pH 6.7 and O H-bond donors at pH 10.7 OH-bond donors at pH 6.7 and 1 H-bond donors at pH 10.7 3 H-bond donors at pH 6.7 and 4 H-bond donors at pH 10.7 4 H-bond donors are pH 6.7 and 3 H-bond donors at pH 10.7

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