The graph on the following slide illustrates how an enzyme catalyzes reactions in biological systems.

To start a reaction, a certain amount of energy must be absorbed by the reactants.

This is called the energy of activation.



Which of the following represents the energy of activation that is modified by an enzyme?

Y axis – amount of energy X axis – Progress of the reaction Two lines of progression. Red line: has a slight increase in energy before it falls to its end result low level energy. Black line: has a larger increase of energy before it falls to its end result of low level energy, which is the same as the red line. A is the slight rise in energy, B is the larger rise in energy, C is the total energy drop from the starting point.