Hydrogen-generating reactions in Syntrophus and Syntrophomonas have $$\Delta$$G°' 0. Can these organisms obtain energy from hydrogen formation?

Question

Hydrogen-generating reactions in Syntrophus and Syntrophomonas have $$\Delta$$G°' > 0. Can these organisms obtain energy from hydrogen formation?

Quizplus · Accepted Answer

Although the hydrogen-generating reactions in Syntrophus and Syntrophomonas have a positive standard free energy change ($$\Delta$$G°' > 0), they can obtain energy from hydrogen formation by coexisting in syntrophy with H₂-consuming bacteria. Utilization of H₂($$\Delta$$G°' < 0) drives the process forward. This process is known as reverse electron transfer, which allows hydrogen to be used as an electron donor for the reduction of carbon dioxide or other compounds. The presence of oxygen is not necessary for this process. Therefore, option C is the correct answer. Options A, B, D, and E are incorrect because they either provide incorrect information or are not supported by the given information.

Hydrogen-Generating Reactions in Syntrophus and Syntrophomonas Have Δ\DeltaΔ G°' > 0 Can These Organisms Obtain Energy from Hydrogen Formation? A)

Hydrogen-Generating Reactions in Syntrophus and Syntrophomonas Have $\Delta$ G°' > 0 Can These Organisms Obtain Energy from Hydrogen Formation?
A)