3. An enzyme is extracted and purified from a sample of E. coli cells. The enzyme's catalytic activity is measured and its absorbance spectrum recorded. Then this same batch of enzyme is put through a series of modifications as outlined in the table below. The first modification step involves adding a large concentration of urea to the solution containing the enzyme molecules. Then the urea is removed using a procedure known as dialysis, which involves placing the enzyme solution inside a semipermeable membrane that allows only the urea to diffuse out. Following this, the enzyme is then treated again with 6 Murea followed by a chemical modification step. During chemical modification, the six lysine residues of the enzyme react with a chemical reagent in the presence of urea. As a result of the reaction, a new methyl group becomes covalently bonded to the end of each of the six lysine residues in the enzyme. In the final step, the chemically modified enzyme is dialyzed to remove urea. Describe the changes in function of the purified enzyme as it is first treated with 6M urea and the dialyzed to remove urea. explain the observation changed in the function.
