Kinases and phosphatases turn proteins on and off
through the following mechanism:
A.
making or breaking disulfide bonds, resulting in changes in
protein conformation or interaction with other proteins
B.
adding and removing phosphate groups, resulting in changes in
protein conformation or interaction with other proteins
C.
adding or hydrolyzing GTP, resulting in changes in protein
conformation or interaction with other proteins
D.
Adding or removing ubiquitin, resulting in changes in
protein conformation or interaction with other proteins