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

Which letter in the figure above represents the difference in free energy between the reactants and the highest energy transition state?

Accepted Answer

a

Question 6

If an enzyme were present, which letter would represent the reduced activation energy?

Accepted Answer

b

Question 7

What does the vertical distance labeled 'd' in the figure above represent?

Accepted Answer

$$\Delta G ($$change in free energy)

Question 8

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

Accepted Answer

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

Question 9

Which of the following best describes the energy profile of an exergonic reaction as shown in the figure above?

Accepted Answer

The products have lower free energy than the reactants.

Question 10

If the reaction in the figure above is catalyzed by an enzyme, what effect does the enzyme have on the activation energy and $$\Delta G$$?

Accepted Answer

The enzyme lowers the activation energy but does not change $$\Delta G.$$

Cell Structure, Energy, and Metabolism: Study Guide for BIOL 2120 Module 3 Assessment

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