1)

2)

3)

    Assuming adenine H2s have the sixmembered ring of other adenines 3A above and below,
each would shift the H2 upfield by 0.75 ppm.  Hence, a flipped out base would have an H2 resonance downfield by 1.5 ppm.

4)

    According to Spera and Bax the alpha carbon resonance of an amino acid in an alpha helix would be about 5 ppm downfiled
of its corresponding position in a beta sheet.

5)