Thiol reagents, such as 1,4-dithiothreitol (dtt), are often added to the solutions of such proteins to protect them from this reaction and to reverse it when it occurs. (the reverse reaction works best at slightly alkaline ph.) draw the product formed when dtt reacts with a protein disulfide bond to liberate the free thiol groups.

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You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.