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19. An average protein will not be denatured by: A) a detergent such as sodium dodecyl sulfate. B) heating to 90C. C) iodoacetate. D) pH10. E) urea. 20. Experiments on denaturation and renaturation after the reduction and reoxidation of the SS - bonds in the enzyme ribonuclease (RNase) have shown that: A) folding of denatured RNase into the native, active conformation, requires the input of energy in the form of heat. B) native ribonuclease does not have a unique secondary and tertiary structure. C) the completely unfolded enzyme, with all SS bonds broken, is atill enzymatically active. D) the enzyme, dissolved in water, is thermodynamically stable relative to the mixture of amino acids whose residues are contained in RNase, E) the primary sequence of RNase is sufficient to determine its specific secondary and tertiary structure