6. (6 points) (Chapter 6, problem 6 in textbook) Consider a small protein containing 101 amino acid residues. The protein will have 200 bonds about which rotation can occur. Assume that three orientations are possible about each of these bonds. a) Based on these assumptions, about how many random-coil conformations will be possible for this protein? b) The estimate obtain in a) is surely too large. Give one reason why. c) If the protein folds entirely into an -helix with H bonds and the only source of enthalpy of stabilization, and each H bonds contributes 4kJ/mole to the enthalpy, estimate Hfolding. Note that the ends of the helices contain fewer hydrogen bonds per residue than in the middle. (Hint: figure our how many H-bonds are in an -helix of n residues