20 Questions
During which process are high-energy electron carriers (NADH and FADH2) generated?
Citric Acid Cycle
What is the main function of the electron transport chain?
To transfer electrons to oxygen
What powers ATP synthesis by oxidative phosphorylation?
The movement of protons
What is the primary catabolic function of the citric acid cycle?
Harvesting of high-energy electrons from carbon fuels (in the form of NADH and FADH2)
How many protons does it take to catalyze the production of a single ATP if NADH pumps 10 H+ and is equal to 2.5 ATP equivalents?
4 H+
How many electrons does FADH2 pump in total and how many ATP does it make?
4 electrons and 1 ATP
What is the reduction potential of a strong reducing agent like NADH?
Negative
What is the reduction potential of a strong oxidizing agent like O2?
Positive
What is the role of electron flow through the electron-transport chain?
To create a proton gradient
What is the function of the proton gradient created by the electron-transport chain?
To power ATP synthesis
Which complex in the electron transport chain is responsible for the transfer of electrons from NADH to coenzyme Q?
Complex I
How many hydrogen ions are pumped out of the matrix of the mitochondrion when two electrons from NADH are transferred to coenzyme Q?
4
Which complex serves as the electron transporter between Complex I and Complex III, as well as Complex II and Complex III?
Complex II
Which complex in the electron transport chain is responsible for the transfer of electrons from produced by Complex I and Complex II to oxidized cytochrome c?
Complex III
Which complex in the electron transport chain is responsible for the transfer of electrons from the reduced form of cytochrome c to molecular oxygen to form water?
Complex IV
What is the function of the proton motive force in chemiosmosis?
To drive the synthesis of ATP by ATP synthase
What happens to the H+ concentration in the matrix during chemiosmosis?
It becomes lower
What is the charge on the matrix side of the inner mitochondrial membrane during chemiosmosis?
Negative
What drives the flow of protons back into the matrix during chemiosmosis?
The H+ concentration gradient
What is the final product formed when molecular oxygen accepts electrons from the reduced form of cytochrome c?
Water
Test your knowledge on the electron transport chain, the final step in cellular respiration. This quiz will cover the process of electron transfer and the generation of high-energy electron carriers.
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