Question

the reaction between nadh and ubiquinone is exergonic, but the reaction, when catalyzed by na -nqr, does not generate much heat in vivo. what factor accounts for this difference? the reaction catalyzed by na -nqr in vivo:

Answer 1

The exergonic reaction between NADH and ubiquinone, when catalyzed by Na-NQR, conserves energy in the form of a proton gradient rather than releasing it as heat. This efficient energy conservation is important for ATP synthesis within the cell.

Step-by-step explanation:

The reaction between NADH and ubiquinone is exergonic, meaning it releases energy. However, when this reaction is catalyzed by Na-NQR in vivo, it does not generate much heat. This is because enzymes like Na-NQR facilitate the transfer of electrons in a way that minimizes energy loss as heat. Instead of releasing the energy primarily as heat, the energy is harnessed to pump ions across the membrane, contributing to the establishment of a proton gradient that is used for ATP synthesis. Therefore, the energy released from the oxidation of NADH by ubiquinone is primarily conserved in the form of a proton gradient rather than as heat. This conservation of energy is crucial for maintaining the energy efficiency of the cell.