Function of β-mercaptoethanol in SDS-PAGE is

Q. Function of β-mercaptoethanol in SDS-PAGE is__________.

1. To give negative charges to amino acids in the proteins
2. For the oxidation of disulfide bonds in the proteins
3. For breaking hydrogen bonds in the proteins
4. For the reduction of disulfide bonds in the proteins

Answer: For the reduction of disulfide bonds in the proteins