Final answer:
Ligand binding to a receptor kinase leads to phosphorylation of the receptor, dimerization, and the binding of cytoplasmic signaling molecules, culminating in a cellular response.
Step-by-step explanation:
When a ligand binds to a receptor kinase, this interaction results in several key events. First, there is the phosphorylation of the cytoplasmic domain of the receptor, typically on tyrosine residues in the case of receptor tyrosine kinases. This modification can create docking sites for other cellular signaling molecules, which can bind to the phosphorylated tyrosines. Second, this binding often leads to the dimerization of the receptor, which allows for the activation of the receptor's kinase activity and subsequent phosphorylation events. Finally, this can enable the binding of cytoplasmic signaling molecules to the phosphorylated receptor, which serves as a pivotal step in the activation of downstream signaling pathways that culminate in a cellular response. In summary, ligand binding to a receptor kinase triggers receptor dimerization, phosphorylation of the cytoplasmic domain of the receptor, and the recruitment of cytoplasmic signaling molecules. Thus, the correct answer is 'All of these choices are correct.'