Final answer:
Cyanide poisoning affects the cytochrome c oxidase enzyme in the mitochondria's inner membrane, disrupting the electron transport chain and ATP synthesis.
Step-by-step explanation:
In cyanide poisoning, cyanide binds to and inhibits the cytochrome c oxidase enzyme of the electron transport chain. The cytochrome c oxidase is found in the mitochondria, specifically in the inner mitochondrial membrane. Cyanide binds to this enzyme and prevents the transfer of electrons, disrupting the electron transport chain and blocking the production of ATP.