Kreb's cycle or the citric acid cycle is a part of cellular respiration involving a series of reactions to release stored energy by the oxidation of Acetly CoA.
The first step of the citric acid cycle shows a decrease in free energy which is coupled with an increase in free energy. It begins with the transfer of acetyl group from the acetyl CoA to form an oxaloacetate which further forms citrate. Acetyl CoA forming CoA shows a decrease in the free energy which is coupled with the conversion of the oxaloacetate into the citrate showing an increase in free energy.
Further, the conversion of citrate into α- ketoglutarate shows a decrease in the free energy which is coupled with the reduction of NAD+ to NADH showing an increase in free energy.
In the Krebs cycle, the decrease in free energy is associated with the increase in free energy during oxaloacetate formation and the reduction of NAD+ to NADH.
We can reach this answer because:
This happens at two specific moments. The first moment occurs in the first phase of the Krebs Cycle when oxaloacetate is formed.
This molecule occurs with the transfer of the Acetyl CoA group, this transfer occurs with an expenditure of energy, which causes the free energy to decrease. However, when releasing this energy, the system experiences an increase in free energy.
The second moment occurs in the second phase of the Krebs Cycle when it is necessary to use the energy of NAD+. This promotes a decrease in free energy. However, the release of this energy promotes an increase in free energy.
It is important to remember that the energy expenditure of NAD+ promotes the reduction of this molecule into an NADH molecule.
More information:
https://brainly.com/question/21687447?referrer=searchResults
