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Questions and Answers
Which complex is responsible for pumping 4 H+ from the matrix to the intermembrane space during electron transport?
Which complex is responsible for pumping 4 H+ from the matrix to the intermembrane space during electron transport?
Which complex is the only electron carrier that has a site available for reacting directly with O2 and contains the copper required to reduce O2 to water?
Which complex is the only electron carrier that has a site available for reacting directly with O2 and contains the copper required to reduce O2 to water?
Which compound has a large negative standard reduction potential (E0) and acts as an oxidizing agent?
Which compound has a large negative standard reduction potential (E0) and acts as an oxidizing agent?
Which complex catalyzes the oxidation of succinate to fumarate?
Which complex catalyzes the oxidation of succinate to fumarate?
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Which complex is responsible for pumping 4 H+ during electron transport?
Which complex is responsible for pumping 4 H+ during electron transport?
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Which compound binds to the reduced Fe2+ of cytochrome oxidase and inhibits electron transport in Complex IV?
Which compound binds to the reduced Fe2+ of cytochrome oxidase and inhibits electron transport in Complex IV?
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Which complex is inhibited by rotenone, preventing electron transfer between FMN and CoQ?
Which complex is inhibited by rotenone, preventing electron transfer between FMN and CoQ?
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Which compound binds to heme iron (Fe3+) in cyto a+a3 and prevents the reduction of electrons in Complex IV?
Which compound binds to heme iron (Fe3+) in cyto a+a3 and prevents the reduction of electrons in Complex IV?
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Study Notes
Electron Transport Complexes
- Complex I (NADH dehydrogenase) is responsible for pumping 4 H+ from the matrix to the intermembrane space during electron transport.
- Complex IV (cytochrome c oxidase) is the only electron carrier that has a site available for reacting directly with O2 and contains the copper required to reduce O2 to water.
Electron Carriers and Inhibitors
- Coenzyme Q (CoQ) has a large negative standard reduction potential (E0) and acts as an oxidizing agent.
- Succinate dehydrogenase (Complex II) catalyzes the oxidation of succinate to fumarate.
Inhibitors of Electron Transport
- Antimycin A binds to the reduced Fe2+ of cytochrome oxidase and inhibits electron transport in Complex IV.
- Rotenone inhibits Complex I, preventing electron transfer between FMN and CoQ.
- Cyanide binds to heme iron (Fe3+) in cytochrome a+a3 and prevents the reduction of electrons in Complex IV.
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Description
Test your knowledge of the electron transport chain with this quiz! Learn about Complex I (NADH dehydrogenase) and Complex II (Succinate dehydrogenase) and their roles in pumping H+ ions and transferring electrons in the mitochondria. Challenge yourself with questions on these important components of cellular respiration.
