Which of the following statements is true? a. the φ and ψ angles about the α-c of amino acids in a polypeptide determine the path of the polypeptide because all combinations of φ and ψ angles are allowable. b. if the ph of a diabetic’s blood is 6.9, the [h+] is less than 10-7.4m c. in the formation of the es complex, the water becomes highly ordered about the substrate thus the second law of thermodynamics is violated. d. the hydrogen bond is about 10 % covalent in nature due to the overlaps in the bond orbitals, and about 90% electrostatic. e. the second law of thermodynamics states that the entropy of the universe decreases in all spontaneous processes.