Which of these statements about hemoglobin is NOT true? A) it is a tetrameric globular protein   b)  it has a prosthetic group called heme   c) it’s dominant motif is beta barrel   d)  its dominant motif is helix-turn-helix The reagent used to break disulfide bonds is: a)  urea   b)  beta-mercaptoethanol   c)   guanidine hydrochloride   d) phosphorus pentachloride

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