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How does the breaking of a disulfide bond change typhoid toxin?(Choice A, The newly created terminal sulfides have different valences for binding and although will not bind exactly to cell surface receptors, they will remain mildly toxic to some cells.(Choice B, A broken disulfide bond alters the tertiary structure of the protein and inhibits normal binding to cell surface receptors, thus eliminating the toxicity.(Choice C,The breaking of the disulfide bond decouples the toxic protein from the typhoid protein complex, yet the toxic protein itself retains its toxicity and causes cellular arrest.(Choice D,The disulfide bond is the main active site of the protein, so the protein is unable to make toxins that will bind to cell surface receptors therefore there is no toxicity.
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