Which of the Following Statements About Molecular Switches is FALSE

Question

Which of the following statements about molecular switches is FALSE?
A)Phosphatases remove the phosphate from GTP on GTP-binding proteins, turning them off.
B)Protein kinases transfer the terminal phosphate from ATP onto a protein.
C)Serine/threonine kinases are the most common types of protein kinase.
D)A GTP-binding protein exchanges its bound GDP for GTP to become activated.

Accepted Answer

Phosphatases remove phosphate groups from proteins, but it is GTPase activity that removes the phosphate from GTP on GTP-binding proteins, not phosphatases. Phosphatases typically act on phosphorylated serine, threonine, or tyrosine residues in proteins.