Final answer:
Wee1 is a serine/threonine kinase responsible for phosphorylating serine and threonine residues in target proteins, playing an essential role in cell regulation and signaling.
Step-by-step explanation:
The enzyme Wee1 is a serine/threonine kinase. This type of enzyme catalyzes the transfer of phosphate groups from ATP to the amino acids serine or threonine in target polypeptides. Kinases play a crucial role in cell signaling and regulation, as they are involved in post-translational modifications such as phosphorylation, which can activate or deactivate proteins, thereby influencing different cellular processes.
Kinases are differentiated by their ability to phosphorylate different amino acid residues, and in the context of the question, Wee1 specifically phosphorylates serine and threonine residues.