As part of a purification technique, a mixture of small-protein hormones and peptides are placed in a gel and exposed to an electric field. the gel was prepared using a buffer at ph 2. one peptide in the mixture is the tetrapeptide ala-val-ile-leu. this peptide will move through the gel toward the terminal.
positive
negative

The correct answer is "negative".

Explanation:

At pH 2 the net charge of the R groups of all the amino acids that comprise the peptide in question would be positive. This happens because of the high content of protons in a solution of pH 2, a value that is below the isoelectric point of all the amino acids. Since the peptide would have a positive net charge, it would migrate to the negative terminal of the gel because opposite charges attract each other.

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