Final answer:
Serine/threonine kinases and tyrosine kinases are enzymes involved in cellular communication through protein phosphorylation. Tyrosine kinases evolved later in evolution and are involved in more sophisticated functions in multicellular organisms.
Step-by-step explanation:
Serine/threonine kinases and tyrosine kinases are two types of enzymes involved in cellular communication through protein phosphorylation. Serine/threonine kinases add phosphate groups to serine or threonine residues in target polypeptides, while tyrosine kinases add phosphate groups to tyrosine residues. Tyrosine kinases evolved later in evolution and are involved in more sophisticated functions such as development, differentiation, and cellular communication in multicellular organisms.