[Campbell Biology P.198] Which of the following statements correctly describes the character... | Practice Question
Which of the following statements correctly describes the characteristics of exergonic and endergonic reactions?
A: Exergonic reactions have a positive ΔG and are non-spontaneous, while endergonic reactions have a negative ΔG and are spontaneous.
B: Exergonic reactions release energy and are spontaneous, while endergonic reactions require energy input and are non-spontaneous.
C: Both exergonic and endergonic reactions are spontaneous, but only exergonic reactions absorb free energy.
D: Both exergonic and endergonic reactions involve a net decrease in free energy, differing only in reaction rate.
Explanation
Exergonic reactions are characterized by a release of free energy ΔG < 0 and are spontaneous, meaning they can proceed without a net input of energy. Conversely, endergonic reactions require an input of free energy ΔG > 0 from their surroundings and are non-spontaneous.