Multiple Choice
In the context of Gibbs free energy, how is free energy typically released from ATP to drive endergonic cellular processes?
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1. Introduction to Biochemistry
Gibbs Free Energy
Multiple Choice
In the context of Gibbs free energy, when ATP is hydrolyzed to ADP and inorganic phosphate (Pi), what is released?
A
Stored chemical energy that is captured entirely in the phosphate group after it leaves ATP
B
Only heat energy with no change in Gibbs free energy (ΔG = 0)
C
A net input of free energy because the reaction is endergonic
D
Free energy that can be used to do cellular work
Verified step by step guidance1
Understand that Gibbs free energy (ΔG) represents the amount of energy available to do work in a system at constant temperature and pressure.
Recognize that ATP hydrolysis involves breaking the bond between the terminal phosphate group and the rest of the ATP molecule, producing ADP and inorganic phosphate (Pi).
Know that this reaction releases free energy because the products (ADP and Pi) are at a lower free energy state than ATP, making the reaction exergonic (ΔG < 0).
Realize that the released free energy is not just heat but is harnessed by the cell to perform various types of work, such as mechanical, transport, or chemical work.
Conclude that the energy released during ATP hydrolysis is free energy available to drive cellular processes, rather than being stored solely in the phosphate group or lost as heat.
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