1) Draw a DNA Watson-Crick base pair between A and T. Draw the nucleotides, not just the bases, include both 3' and 5' phosphate groups. Label all the atoms. Indicate the hydrogen bond donors and acceptors.

2) Draw a DNA Watson-Crick base pair between C and G. Draw the nucleotides, with both 3' and 5' phosphate groups. Label all the atoms. Indicate the hydrogen bond donors and acceptors.

3) Draw a base pair between A and G with hydrogen bonds between the N7 and N6 of A and the N2 and N3 of G.

4) For the following concentrations, give the driving force (deltaG) for the reaction [ATP] = 5.0 mM, [ADP] = 1.0 mM, [Pi] = 0.5 mM, T = 37C.

5) Label the bases and the atoms (that are visible) in this figure. Indicate HB distances.