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.

1. glaciers are melting

2. more water going into ocean (water's such as fresh waters, etc)

haploid cells;