Question 1

Which letter in the figure above represents the activation energy of the reaction in the absence of an enzyme?

Accepted Answer

a

Question 2

Which letter in the figure above corresponds to the change in free energy ($$\Delta G) $$for the reaction?

Accepted Answer

d

Question 3

Based on the figure above, is the reaction spontaneous or nonspontaneous?

Accepted Answer

Spontaneous, because $$\Delta G \u003c 0$$

Question 4

Which of the following terms best describes the forward reaction in the figure above?

Accepted Answer

exergonic, $$\Delta G \u003c 0$$

Question 5

If an enzyme were added to catalyze the reaction shown in the figure, which letter would decrease in length?

Accepted Answer

a

Question 6

Which letter in the figure above represents the difference in free energy between reactants and products?

Accepted Answer

d

Question 7

What does the vertical distance labeled 'a' in the figure represent?

Accepted Answer

The activation energy without an enzyme

Question 8

If the reaction shown in the figure is coupled to an endergonic reaction, what must be true about the overall $$\Delta G$$?

Accepted Answer

The overall $$\Delta G$$ must be negative for the coupled reactions to proceed spontaneously.

Question 9

Which letter in the figure would be reduced if a competitive inhibitor was present?

Accepted Answer

None; competitive inhibitors do not change activation energy, only the rate of reaction.

Question 10

If the products (C + D) in the figure had higher free energy than the reactants (A + B), which of the following would be true?

Accepted Answer

The reaction would be endergonic and $$\Delta G$$ would be positive.

Guided Study: Energy Diagrams and Reaction Thermodynamics

Study Guide - Practice Questions