Oxidative Phosphorylation MDCAT Quiz: Oxidative phosphorylation is the last step of cellular respiration, in which energy from high-energy electrons is used to drive the synthesis of ATP. It takes place in the inner mitochondrial membrane and depends on the electron transport chain (ETC) and chemiosmosis. This is the most efficient method for the production of ATP; as many as 32-34 ATPs are produced per glucose molecule. In the process of oxidative phosphorylation, electrons carried by NADH and FADH₂ are passed through the ETC, a series of protein complexes and mobile carriers located in the inner mitochondrial membrane. The flow of electrons causes pumping of protons (H⁺) across the inner membrane, resulting in a proton gradient. This gradient drives the enzyme ATP synthase, which catalyzes the synthesis of ATP as protons flow back into the mitochondrial matrix. Oxygen is the final electron acceptor, and it combines with electrons and protons to form water. The MDCAT students have to learn the detail about oxidative phosphorylation in the bioenergetic and metabolic pathway.
Test Your Knowledge with an MDCAT Quiz
An MDCAT Quiz on Oxidative Phosphorylation will help you assess your understanding of the electron transport chain, ATP synthesis, and the role of oxygen in this process. The quiz will include topics such as proton gradients, ATP synthase function, and the energy yield of NADH and FADH₂. Regular practice with these quizzes will ensure you are prepared for related MDCAT questions on energy production in cells.
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Free Flashcards for Quick Revision
Free Flashcards on Oxidative Phosphorylation summarizes the critical steps and components involved in ATP production. These flashcards cover the role of the electron transport chain, the proton motive force, and, most importantly, the importance of oxygen acting as the final electron acceptor. They provide a very nice way to rapidly review and reinforce the important details for the MDCAT exam.
Oxidative phosphorylation is crucial to understanding efficient energy production within cells via the process of aerobic respiration. Use our resources, including quizzes and flashcards, to help you master this portion of your exam prep for MDCAT.
What is the primary purpose of oxidative phosphorylation?
To produce ATP
In which part of the cell does oxidative phosphorylation occur?
Mitochondria
What is the role of the electron transport chain in oxidative phosphorylation?
To transfer electrons
Which molecule serves as the final electron acceptor in the electron transport chain?
Oxygen
What does the electron transport chain ultimately produce in oxidative phosphorylation?
ATP
What protein complex is responsible for ATP synthesis in oxidative phosphorylation?
ATP synthase
How is a proton gradient created in oxidative phosphorylation?
By electron transfer
Which molecule donates electrons to the electron transport chain during oxidative phosphorylation?
NADH
What happens to the electrons as they travel down the electron transport chain?
They lose energy
What is the role of oxygen in oxidative phosphorylation?
To accept electrons
How many ATP molecules are produced from the complete oxidation of one molecule of glucose?
38
What is the main purpose of the proton gradient generated during oxidative phosphorylation?
To drive ATP synthesis
What is the name of the process that uses the proton gradient to synthesize ATP in oxidative phosphorylation?
Chemiosmosis
What happens to NADH and FADH2 during oxidative phosphorylation?
They donate electrons
What does the electron transport chain pump across the mitochondrial membrane?
Protons
What is the energy source that drives ATP synthesis during oxidative phosphorylation?
Proton gradient
What molecule is regenerated when NADH is oxidized in the electron transport chain?
NAD+
In which part of the mitochondrion does the electron transport chain take place?
Inner mitochondrial membrane
What is the proton motive force in oxidative phosphorylation?
The gradient of protons
How does the proton gradient across the inner mitochondrial membrane contribute to ATP production?
It drives ATP synthase
What is the final product of oxidative phosphorylation?
ATP
How many protons must pass through ATP synthase to produce one ATP molecule?
4
What is the main function of oxygen in oxidative phosphorylation?
To act as the final electron acceptor
How are electrons passed from NADH to the electron transport chain?
Through NADH dehydrogenase
What complex in the electron transport chain is responsible for pumping protons into the intermembrane space?
Complex I
What molecule is synthesized by ATP synthase during oxidative phosphorylation?
ATP
What is the process called where ATP is synthesized in oxidative phosphorylation?
Chemiosmosis
What is the role of cytochrome c in the electron transport chain?
To transfer electrons
Which of the following is NOT a result of oxidative phosphorylation?
Production of oxygen
What molecule is responsible for carrying electrons from complex I to complex III in the electron transport chain?
Coenzyme Q
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