Question 1

Which of the following best describes an exergonic reaction in biological systems?

Accepted Answer

A reaction that releases energy and has products with lower free energy than the reactants.

Question 2

The molecule shown in the third image is critical for cellular energy transfer. What is its name and primary function?

Accepted Answer

ATP; it stores and transfers energy for cellular processes.

Question 3

Which of the following statements about endergonic reactions is correct?

Accepted Answer

They require an input of energy to proceed.

Question 4

In the context of cellular metabolism, which reaction is most likely to be coupled with the hydrolysis of ATP?

Accepted Answer

An endergonic reaction such as the synthesis of macromolecules.

Question 5

Which of the following best explains why the hydrolysis of ATP is exergonic?

Accepted Answer

It forms stronger bonds in the products than in the reactants, releasing free energy.

Question 6

A cell needs to drive an endergonic reaction with a $$\Delta G = +15 kJ/$$mol. If the hydrolysis of ATP has $$\Delta G = -30 kJ/$$mol, what is the net $$\Delta G$$ for the coupled reaction?

Accepted Answer

$$-15 kJ/$$mol

Question 7

Which of the following is a real-life example of an exergonic reaction in human cells?

Accepted Answer

The breakdown of glucose during cellular respiration.

Question 8

Why are C-H bonds considered to have higher potential energy than O-H bonds?

Accepted Answer

Because electrons in C-H bonds are shared more equally, making them less stable and higher in energy.

Question 9

Which of the following statements about the relationship between exergonic and endergonic reactions is correct?

Accepted Answer

Exergonic reactions can provide the energy needed to drive endergonic reactions in cells.

Question 10

A scientist disrupts the cell membrane of a prokaryote. Which process is most likely to be immediately affected?

Accepted Answer

ATP synthesis via chemiosmosis

Question 11

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP transfers energy from exergonic to endergonic reactions.

Question 12

If a reaction has a negative $$\Delta G$$, what can be concluded about the reaction?

Accepted Answer

It is exergonic and can occur spontaneously.

Question 13

Which of the following is true regarding the coupling of reactions in metabolism?

Accepted Answer

Exergonic reactions are used to drive endergonic reactions, often through ATP hydrolysis.

Question 14

Which of the following best explains why ATP is often called the 'energy currency' of the cell?

Accepted Answer

It can easily transfer a phosphate group to other molecules, releasing energy that can be used for cellular work.

Question 15

Which of the following is a correct statement about the relationship between the structure of ATP and its function?

Accepted Answer

The three phosphate groups in ATP are negatively charged and their repulsion makes the molecule unstable, so breaking a phosphate bond releases energy.

Prokaryotic Energy and Chemical Reactions

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