Final answer:
The expected charge of the peptide ala-arg-lys would be positive.
Step-by-step explanation:
The expected charge of the peptide ala-arg-lys can be determined by considering the charges of the individual amino acids and their positions in the sequence. Alanine (Ala) is neutral, arginine (Arg) is positively charged, and lysine (Lys) is also positively charged. Since both arginine and lysine are basic amino acids with positive charges, the expected charge of the peptide would be positive.