Final answer:
An endergonic reaction graph illustrates an increase in energy from reactants to products with the transition state at the highest energy level, indicating energy absorption during the reaction.
Step-by-step explanation:
An endergonic reaction graph would show that the products are at a higher energy level than the reactants, indicating that energy was absorbed during the reaction. On the vertical axis representing energy, the reactants start at a lower point, then the energy level increases to reach the transition state, which is at the highest point on the energy scale. The graph then goes down slightly to represent the products, which still are at a higher energy level than the reactants, demonstrating that the reaction required an input of energy (was endergonic) to proceed.
The transition state on a vertical energy scale will always appear at a higher energy level than both the reactants and the products for both endergonic and exergonic reactions. However, an endergonic reaction differs in that it results in products with higher energy than the reactants, as opposed to exergonic reactions where the products have lower energy.