An Enzyme That Is Described as a Protein Kinase Is

An enzyme that is described as a protein kinase is a(n)

A) hydrolase that removes an amino acid from a protein.
B) transferase that transfers a phosphate group to a protein substrate.
C) ligase that adds an amino acid to a protein.
D) isomerase that changes one protein into another.
E) protease that transfers electrons from one protein to another.