A decapeptide composed of MFTGPYCPRW was dissolved in 20 mM HEPES (pH 7.0), 50mM NaCl, 50mM Na2SO4, 5mM DTT, and 4mM EDTA. Which one of the following statements about the peptide in the given buffer conditions is correct?
1
The peptide forms a dimer through disulfide bonds.
2
The peptide has a net positive charge.
3
The peptide has a net negative charge.
4
The peptide is neutral.