Final answer:
Kinases are the enzymes that add phosphate groups to protein targets through phosphorylation.
Step-by-step explanation:
The general name for enzymes that add phosphate groups to protein targets is kinases. Phosphorylation is a common post-translational modification where a phosphate group is added to serine, threonine, or tyrosine residues of proteins. This addition is catalyzed by kinases. The phosphate group can then be removed by enzymes known as phosphatases.