part a put the steps of the process of signal transduction in the order they occur: 1. a conformational change in the signal-receptor complex activates an enzyme. 2. protein kinases are activated. 3. a signal molecule binds to a receptor. 4. target proteins are phosphorylated. 5. second messenger molecules are released. put the steps of the process of signal transduction in the order they occur: 1. a conformational change in the signal-receptor complex activates an enzyme. 2. protein kinases are activated. 3. a signal molecule binds to a receptor. 4. target proteins are phosphorylated. 5. second messenger molecules are released. 1, 2, 3, 4, 5 3, 1, 2, 4, 5 1, 2, 5, 3, 4 3, 1, 5, 2, 4
