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All of energy metabolism is tied together. The Krebs cycle and the electron transport chain are among the most closely linked because they physically share a single enzyme that plays a role in both pathways. This creates an interesting bottleneck or point of congestion. If this enzyme stops, it can directly interfere with both the Krebs cycle and the electron transport chain.

What is the name of this enzyme?

A

Citrate synthase.

B

Aconitase.

C

α-ketoglutarate dehydrogenase complex.

D

Succinate dehydrogenase.

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