Question

Describe the roles of NAD+ in the enzyme reactions of the Krebs Cycle and the respiratory (electron transport) chain/chemiosmosis..

NAD+ is an electron acceptor for several enzymes. These enzymes include:

1. Isocitrate dehydrogenase.
2. 2-oxoglutarate dehydrogenase.
3. Malate dehydrogenase.

Answer 1

NAD+ serves as an electron acceptor in the enzyme reactions of the Krebs Cycle and the electron transport chain. It helps convert compounds and transfers electrons to produce ATP.

Step-by-step explanation:

In the Krebs Cycle, NAD+ serves as an electron acceptor in several enzyme reactions. Specifically, NAD+ is involved in the reactions catalyzed by isocitrate dehydrogenase, 2-oxoglutarate dehydrogenase, and malate dehydrogenase. These enzymes help convert various compounds, such as isocitrate, 2-oxoglutarate, and malate, into other molecules as part of the cycle. NAD+ accepts electrons from these reactions and becomes reduced to NADH, which then donates the electrons to the electron transport chain in the process of chemiosmosis. In the electron transport chain, NADH is one of the primary electron carriers, transferring electrons between protein complexes to generate ATP.