Final answer:
An inhibitor that interferes with dimerization or autophosphorylation would inhibit a cell-signaling pathway mediated by a receptor tyrosine kinase.
Step-by-step explanation:
A chemical that inhibits a cell-signaling pathway mediated by a receptor tyrosine kinase would most likely prevent the dimerization and downstream cellular response of the receptor. In this pathway, the binding of a signaling molecule to the extracellular domain of the receptor causes it to dimerize, and tyrosine residues on the intracellular domain are autophosphorylated, triggering the downstream cellular response. Therefore, an inhibitor that interferes with dimerization or autophosphorylation would inhibit the pathway.