Question 1

Refer to the energy diagram provided. Which arrow best represents the activation energy ($$E_A) of $$the reaction when an enzyme is present?

Accepted Answer

The short red arrow

Question 2

In the energy diagram, what does the difference in height between the reactants and products (yellow arrow) represent?

Accepted Answer

The change in free energy ($$\Delta G) of $$the reaction

Question 3

What does the black curve in the diagram represent?

Accepted Answer

The course of the reaction without enzyme

Question 4

Which statement best explains the effect of the enzyme on the reaction as shown in the diagram?

Accepted Answer

The enzyme lowers the activation energy ($$E_A) $$required for the reaction

Question 5

If the black arrow represents the activation energy without enzyme and the red arrow represents the activation energy with enzyme, what can you conclude about the rate of the reaction in the presence of the enzyme?

Accepted Answer

The reaction rate increases because the activation energy is lower

Question 6

In the context of the diagram, what does the horizontal axis most likely represent?

Accepted Answer

Progress of the reaction

Question 7

Which of the following is true about $$\Delta G ($$yellow arrow) in enzyme-catalyzed versus uncatalyzed reactions?

Accepted Answer

$$\Delta G is $$the same for both catalyzed and uncatalyzed reactions

Question 8

What would happen to the reaction if the enzyme were denatured and lost its shape?

Accepted Answer

The activation energy would increase to the level shown by the black arrow

Question 9

Which part of the diagram would change if a competitive inhibitor was added to the reaction?

Accepted Answer

The height of the red curve (activation energy with enzyme) would increase

Question 10

If the reaction shown is exergonic, which of the following statements is correct regarding the energy of the products compared to the reactants?

Accepted Answer

The products have less free energy than the reactants

Unit 3 Test Review: Enzyme Function, Energy, and Cellular Processes

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