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You are working with a single polypeptide chain in the laboratory to determine what environmental factors affect its structure. At a pH of 7, the polypeptide has normal activity, but when you lower the pH to 5, you find that the polypeptide has no activity. Returning the pH back to 7 restores the activity of the polypeptide.Which statements likely explain the changes in protein activity observed in this scenario? Select all that apply.Responses

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