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HomeHomework HelpbiologyElectron Transport Chain

Electron Transport Chain

The electron transport chain (ETC) is a series of protein complexes and other molecules located in the inner mitochondrial membrane that facilitate the transfer of electrons from electron donors, such as NADH and FADH2, to electron acceptors, ultimately generating a proton gradient that drives ATP synthesis through oxidative phosphorylation. This process is essential for cellular respiration and energy production in aerobic organisms.

intermediate
2 hours
Biology
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Overview

The electron transport chain (ETC) is a vital component of cellular respiration, located in the inner mitochondrial membrane. It functions by transferring electrons from electron carriers like NADH and FADH2 through a series of protein complexes, ultimately creating a proton gradient that drives ATP...

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Key Terms

ATP
Adenosine triphosphate, the energy currency of the cell.

Example: Cells use ATP to power various biological processes.

Oxidative Phosphorylation
The process of ATP production that occurs in the mitochondria using the electron transport chain.

Example: Oxidative phosphorylation is the final stage of cellular respiration.

Proton Gradient
A difference in proton concentration across a membrane, used to drive ATP synthesis.

Example: The proton gradient created by the ETC powers ATP synthase.

NADH
Nicotinamide adenine dinucleotide, an electron carrier that donates electrons to the ETC.

Example: NADH is produced during glycolysis and the Krebs cycle.

FADH2
Flavin adenine dinucleotide, another electron carrier that feeds electrons into the ETC.

Example: FADH2 is generated during the Krebs cycle.

Chemiosmosis
The movement of protons across a membrane to generate ATP.

Example: Chemiosmosis occurs in the mitochondria during ATP synthesis.

Related Topics

Krebs Cycle
The Krebs cycle is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetyl-CoA.
intermediate
Cellular Respiration
Cellular respiration is the process by which cells convert glucose and oxygen into energy, carbon dioxide, and water.
intermediate
Metabolism
Metabolism encompasses all chemical reactions that occur within a living organism to maintain life.
advanced

Key Concepts

oxidative phosphorylationATP synthesiselectron carriersproton gradient