Refer to the graph and info for questions 39–42. Image Des…
Refer to the graph and info for questions 39–42. Image Description A stepwise graph, also known as an energy diagram depict changes in free energy (ΔG) as a reaction proceeds from start to finish. The y-axis is labeled as ‘free energy (kcal/mol)’ and the x-axis represents ‘time’, suggesting the progression of a chemical reaction. Five distinct stages are marked along the graph’s course with the letters A to E, each representing a different energy state within the reaction. The graph begins at a point labeled ‘A’ below the baseline, indicating an exothermic reaction initiation, rises to ‘B’, then to a higher point ‘C’, drops to ‘D’, and finally goes up again to ‘E’, indicating the end of the reaction. The stepwise nature suggests that there are intermediate stages or transition states that the reaction passes through before reaching completion. In a metabolic pathway, a series of enzymatic reactions catalyzes the conversion of molecule A to molecule E. Several intermediate steps are involved in which the product of one reaction becomes the substrate for the next. The graph illustrates the changes of free energy that occur at each step in the pathway.
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