Predict the effect of cyanide on mitochondrial electron transport: The energy of

Question

Predict the effect of cyanide on mitochondrial electron transport:

The energy of high-energy electrons is released as heat.

The citric acid cycle continues to operate.

Oxygen continues to pick up electrons at the end of the electron transport chain.

NADH no longer feeds electrons into the mitochondrial electron transport chain.

The ATP synthase continues to produce ATP.

The energy of high-energy electrons is released as heat.

The citric acid cycle continues to operate.

Oxygen continues to pick up electrons at the end of the electron transport chain.

NADH no longer feeds electrons into the mitochondrial electron transport chain.

The ATP synthase continues to produce ATP.

Explanation / Answer

The correct statement is "NADH no longer feeds electrons into the mitochondrial electron transport chain."

Cyanide is a chemical compound that contains monovalent combining group CN. It binds to a cytochrome c oxidase in the electron transport chain and stops the transport of electrons to oxygen. This blocks the further passage of electrons through the electron transport chain, thus halts ATP production. As no ATP is being produced, the electron transport chain stops working, concentration of protons build up and gradient becomes large.

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