Enzymes that alter another protein or enzyme's activity by attaching a phosphate group are called:

A) kinases
B) phosphatases
C) phosphators
D) transcription factors
E) coenzymes

Kinases

Enzymes that catalyze the transfer of phosphate groups from ATP to acceptor molecules. See protein kinases. Compare with phosphatases.

Phosphate Group

A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms, critical in the structure of nucleic acids and ATP.

Protein Activity

Refers to the functional capacity of a protein to perform its biochemical role, which may include catalyzing reactions, binding to other molecules, or structural support.