Final answer:
The correct answer is C. Lysine and glutamic acid, as they would form ionic bonds due to their opposite charges, with Lysine being positively charged and Glutamic acid being negatively charged.
Step-by-step explanation:
The student asked which pairs of amino acid residues are expected to form ionic bonds. Ionic bonds in amino acids are typically formed between amino acids with opposite charges, specifically between acidic amino acids (which have a negative charge) and basic amino acids (which have a positive charge). Among the options provided, Lysine is a basic amino acid with a positive charge, and Glutamic acid is an acidic amino acid with a negative charge, making C. Lysine and glutamic acid the correct answer because they can form ionic bonds due to their opposite charges. Arginine is also positively charged, but it was incorrectly noted as negatively charged in the provided reference material. In reality, both Arginine and Lysine are basic amino acids, not likely to form ionic bonds with each other as indicated in option B.