Q: A reaction has a $\Delta G < 0$. Which of the following is true about this reaction?

It is exergonic and spontaneous.

Q: Which of the following best explains why living organisms are considered open systems?

They exchange both matter and energy with their surroundings.

Q: Which of the following is a correct statement about ATP?

ATP stores energy in the chemical bonds between its phosphate groups.

Q: Which of the following best describes the role of enzymes in biological reactions?

They lower the activation energy ($E_A$) required for a reaction to proceed.

Q: A competitive inhibitor decreases the rate of an enzyme-catalyzed reaction by:

Binding to the active site and competing with the substrate.

Q: Which of the following is an example of energy coupling in cells?

Using the energy released from ATP hydrolysis to drive the active transport of ions across a membrane.

Q: Which of the following statements about feedback inhibition is correct?

The end product of a metabolic pathway inhibits an enzyme that acts early in the pathway.

Question 1

Which of the following best describes metabolism in a living cell?

Accepted Answer

The sum of all chemical reactions taking place in a living cell.

Question 2

Which of the following reactions is an example of a catabolic pathway?

Accepted Answer

The breakdown of glucose during cellular respiration.

Question 3

Which statement about the first law of thermodynamics is correct?

Accepted Answer

Energy can be transferred or transformed, but it cannot be created or destroyed.

Question 4

A reaction has a $\Delta G < 0$. Which of the following is true about this reaction?

Accepted Answer

It is exergonic and spontaneous.

Question 5

Which of the following best explains why living organisms are considered open systems?

Accepted Answer

They exchange both matter and energy with their surroundings.

Question 6

Which of the following is a correct statement about ATP?

Accepted Answer

ATP stores energy in the chemical bonds between its phosphate groups.

Question 7

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

They lower the activation energy ($E_A$) required for a reaction to proceed.

Question 8

A competitive inhibitor decreases the rate of an enzyme-catalyzed reaction by:

Accepted Answer

Binding to the active site and competing with the substrate.

Question 9

Which of the following is an example of energy coupling in cells?

Accepted Answer

Using the energy released from ATP hydrolysis to drive the active transport of ions across a membrane.

Question 10

Which of the following statements about feedback inhibition is correct?

Accepted Answer

The end product of a metabolic pathway inhibits an enzyme that acts early in the pathway.

Question 11

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

Accepted Answer

Substrate binding induces a change in the shape of the enzyme's active site, leading to a tighter fit.

Question 12

Which of the following factors does NOT affect enzyme activity?

Accepted Answer

The color of the enzyme.

Question 13

A reaction has $\Delta G = +5$ kcal/mol. Which of the following is true?

Accepted Answer

The reaction is endergonic and requires an input of energy.

Question 14

Which of the following best explains why enzymes are reusable?

Accepted Answer

Enzymes are not consumed or permanently changed during the reaction.

Question 15

Which of the following is true about noncompetitive enzyme inhibitors?

Accepted Answer

They bind to a site other than the active site and alter the enzyme's shape.

Question 16

Which of the following best describes the second law of thermodynamics?

Accepted Answer

Natural processes tend to move towards a state of greater disorder or entropy.

Question 17

Which of the following is an example of potential energy?

Accepted Answer

A roller coaster car at the top of a hill.

Question 18

Which of the following best describes allosteric regulation of enzymes?

Accepted Answer

A regulatory molecule binds to a site other than the active site, stabilizing either the active or inactive form of the enzyme.

Question 19

Which level of protein structure is required for allosteric regulation?

Accepted Answer

Quaternary structure.

Question 20

A metabolic pathway is regulated by feedback inhibition. What would happen if the end product of the pathway is removed from the system?

Accepted Answer

The pathway would resume, and more end product would be produced.

Chapter 6 Study Guide

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