Answer
Fig:18.22.
In both cases, the product of one reaction is an enzyme that catalyzes the production of many more molecules in the succeeding step. There is a geometric progression in the increase of molecules produced at each step. Ultimately, a large number of products result from a small initial chemical reaction.
Work Step by Step
Series 1: Stimulus>hormone>cAMP, protein kinase>activated enzyme>many metabolic product.
Series 2: Hormone>Factor XII>Factir XI>FactorXI>Factor IX>Factor VII>Factor X>prothrombon
activator>thrombin>fibrin.
There is an amplification of processes at each step in both series of reactions.
