18.
In cell extracts with high protein content, before phenol treatment:
A:
Chloroform is used to break polypeptides to small fragments.
B:
SDS is used to break polypeptides to small fragments.
C:
Proteases are used to break polypeptides to small fragments.
D:
Acrylamide is used to break polypeptides to small fragments.
The answer is:
C