32.
The cell-free extract prepared from E. coli cells over-expressing enzyme β- glucosidase showed the activity of 1.5 units per ml (protein concentration 2 mg per ml). The Ni-NTA purified preparation showed the activity of 75 units per ml (protein concentration 100 μg per ml). Calculate the fold purification of the enzyme achieved?
A:
0.001
B:
0.02
C:
50
D:
1000
The answer is:
D
