Question 1

Which of the following best describes an exergonic reaction in terms of Gibbs free energy ($$\Delta G) $$and energy flow?

Accepted Answer

$$\Delta G is $$negative; energy is released

Question 2

A scientist is studying a metabolic pathway in which the end product inhibits an enzyme that catalyzes an early step in the pathway. What is this regulatory mechanism called?

Accepted Answer

Feedback inhibition

Question 3

Which of the following statements about enzymes is TRUE?

Accepted Answer

Enzymes lower the activation energy ($$E_a) of a $$reaction

Question 4

What is the primary difference between a competitive inhibitor and a noncompetitive inhibitor?

Accepted Answer

Competitive inhibitors bind to the active site; noncompetitive inhibitors bind elsewhere on the enzyme

Question 5

Which of the following is an example of an anabolic process?

Accepted Answer

Dehydration synthesis of proteins from amino acids

Question 6

A reaction has reactants with less energy than the products. Which of the following is TRUE?

Accepted Answer

The reaction is endergonic and requires energy input

Question 7

Which of the following best describes the induced fit model of enzyme function?

Accepted Answer

The enzyme changes shape slightly to bind the substrate more tightly

Question 8

Which of the following would most likely decrease the rate of an enzyme-catalyzed reaction?

Accepted Answer

Decreasing the temperature below the enzyme's optimal temperature

Question 9

What is the function of a coenzyme in an enzymatic reaction?

Accepted Answer

Acts as an organic molecule that assists enzyme function

Question 10

Which of the following statements about metabolic pathways is correct?

Accepted Answer

A linear pathway ends with a final product

Question 11

A researcher adds a molecule to an enzyme solution and observes that the enzyme's activity is turned off. The molecule can be removed to restore activity. What type of regulation is this?

Accepted Answer

Allosteric inhibition

Question 12

Which of the following is NOT a mechanism by which enzymes speed up chemical reactions?

Accepted Answer

Increasing the $$\Delta G of $$the reaction

Question 13

If a molecule binds covalently to the active site of an enzyme, what is the result?

Accepted Answer

The enzyme is irreversibly inhibited

Question 14

Which of the following is a correct statement about the laws of thermodynamics as they apply to biological systems?

Accepted Answer

Every energy transfer increases the entropy of the universe

Question 15

Which of the following best describes the transition state in an enzyme-catalyzed reaction?

Accepted Answer

A high-energy state that the enzyme–substrate complex passes through

Question 16

A patient has a genetic mutation that causes all their enzymes to denature at normal body temperature. Which of the following would most likely occur?

Accepted Answer

Metabolic reactions would slow dramatically or stop

Question 17

Which of the following is TRUE about the relationship between molecule size and energy storage?

Accepted Answer

Larger molecules store more energy due to more bonds

Question 18

Which of the following is an example of potential energy in a biological system?

Accepted Answer

Chemical bonds in glucose

Question 19

What is the effect of saturating an enzyme with substrate molecules?

Accepted Answer

The reaction rate will level off at $$v_{max}$$

Question 20

Which of the following best describes a ribozyme?

Accepted Answer

An RNA molecule that acts as an enzyme

Bioenergetics and Enzyme Function: Study Notes for General Biology

Guida di studio - Domande di pratica

Study guide - Flashcard