Final answer:
Enzyme-linked receptors contain both receptor and transduction mechanisms within the same protein.
Step-by-step explanation:
The receptor and transduction mechanisms contained within the same protein are found in the Enzyme-linked receptors. These receptors have an extracellular domain that binds to the ligand and an intracellular domain that acts as an enzyme and gets activated upon ligand binding. When the enzyme domain is activated, it initiates a signaling cascade within the cell.