Question:
Study the incorrect statement with respect to an overview of the electron transport system $(ETS)$.
Study the incorrect statement with respect to an overview of the electron transport system $(ETS)$.
Updated On: Jul 7, 2022
- Ubiquinone receives reducing equivalents via., $FADH_2$ (complex II) that is generated during oxidation of succinate in the $TCA$ cycle
- As the electrons move down the system, energy is released and used to form $ATP$
- $2ATPs$ are formed for every pair of electrons that enters by way of $NADH$ and $3ATPs$ are formed for every pair of electrons that enters by way of $FADH_2$
- Oxygen, the final $e^-$ acceptor becomes a part of water
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The Correct Option is C
Solution and Explanation
$3\,ATPs$ are formed for every pair of electrons that enters by way of $NADH$ and $2\, ATPs$ are formed for every pair of electrons that enters by way of $FADH_2$.
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Concepts Used:
Electron Transport System
The electron transport chain or system is the sequence of electron carriers, enzymes, and cytochrome that passes electrons from one to another through the redox reaction. It is electron transport-linked phosphorylation.
It contains flavin nucleotides (FAD), nicotinamide adenine dinucleotide (NAD), coenzyme Q, and cytochromes localized in F1 particles of mitochondria. It occurs in the inner mitochondrial membrane along with cristae.
In this process five (5) complexes are involved namely, I- NADH-UQ reductase, II- Succinate-UQ reductase, III- UQH2 -cytochrome C reductase, IV- Cytochrome C oxidase, and V is connected with F0−F1 particles.
In this process, NAD and FAD are minimized.
Steps:
- Redox at complex I: Four (4) protons are pumped from the matrix to intermembrane space.
- Redox at complex II: Coenzyme Q collects the electrons from complex I and II, and goes to complex III.
- Redox of complex III: Four (4) protons are again pumped from matrix to intermembrane space and cytochrome C transports electrons to the complex IV.
- Redox of complex IV: Two (2) protons are pumped from the matrix to intermembrane space and the formation of water occurs in the matrix.
- ATP synthase action: It pumps protons from intermembrane space to matrix and generates ATP. It is associated with oxidative phosphorylation.