18 Questions
In ATP synthesis, what happens when the γ subunit rotates by 120° in a counterclockwise direction?
Converts the T-form subunit into the O-form
What is the main role of the proton gradient in ATP synthesis?
Releasing ATP from the synthase
Which system introduces electrons from cytoplasmic NADH into the electron transport chain?
Malate–aspartate shuttle
How is electron motion across the membrane related to ATP synthesis?
Drives the rotation of the c ring
What is the ATP yield ratio for NADH in terms of ATP produced?
2.5 ATP per NADH
How does ADP enter the mitochondrial matrix?
Through an antiporter
What is the main function of Iron–sulfur proteins (FeSPs) in the electron transport chain?
Promote the flow of electrons
Which molecule is essential as a reactant for ATP synthesis?
Molecular O2
What is the role of ATPase in ATP synthesis?
Creates a proton-rich environment
Which molecular assembly carries out the oxidative phosphorylation of ADP or the synthesis of ATP?
ATP synthase
According to chemiosmotic coupling, what couples electron transport and ATP synthesis in the mitochondria?
Proton gradient (proton-motive force)
Which mechanism leads to the release of tightly bound ATP from ATP synthase?
Proton flow through ATP synthase
What is the main function of the Electron-transport chain (ETC) and Oxidative Phosphorylation?
Generating ATP
What is the role of the Proton Gradient in oxidative phosphorylation?
Creating a pH gradient within the mitochondrion
Which structure in the cell is responsible for hosting the Electron-transport chain and Oxidative Phosphorylation processes?
Mitochondria
What drives electron transfer in the Reduction Potentials of ETC?
Reduction potential of redox couples
Which process depends on the coupling between oxidation and phosphorylation?
Oxidative Phosphorylation
What is a common inhibitor that can block Electron-transport chain (ETC) and ATP synthase?
Cyanide
This quiz focuses on identifying inhibitors that can block the electron transport chain and oxidative phosphorylation processes in mitochondria. Topics covered include ETC, oxidative phosphorylation, and proton gradient.
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