electron transport
C2Technical/Scientific
Definition
Meaning
A sequence of biochemical reactions in cells where electrons are passed between molecules (proteins, coenzymes) along a membrane, releasing energy used to create a proton gradient for ATP synthesis.
The final stage of cellular respiration in mitochondria, specifically referring to the electron transport chain. In broader physics/engineering contexts, it can refer to the movement of electrons through a material or circuit.
Linguistics
Semantic Notes
In biology, almost exclusively refers to the mitochondrial process. In physics/chemistry, it's a more general term for electron flow. It is a compound noun functioning as a single concept.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling follows standard BrE/AmE conventions for component words (e.g., 'transport' vs. 'transport').
Connotations
Identical technical connotations in scientific contexts.
Frequency
Equally high frequency in respective scientific literatures.
Vocabulary
Collocations
Grammar
Valency Patterns
The [noun] undergoes electron transport.Electron transport occurs in the [location].[Agent] inhibits/facilitates electron transport.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None”
Usage
Context Usage
Business
Virtually never used.
Academic
Core term in biochemistry, cell biology, bioenergetics, and related physical sciences.
Everyday
Extremely rare outside educational or popular science contexts.
Technical
Precise, defining term for a fundamental biochemical process.
Examples
By Part of Speech
verb
British English
- The electrons are transported along the inner membrane.
- The protein transports electrons from NADH.
American English
- The complex transports electrons to oxygen.
- Electrons transport energy across the membrane.
adverb
British English
- The reaction proceeds electron-transport-wise via complex III.
American English
- The system functions electron-transport efficiently under these conditions.
adjective
British English
- The electron-transport machinery is highly efficient.
- They studied the electron-transport properties of the film.
American English
- Electron-transport inhibitors can be toxic.
- The model describes electron-transport dynamics.
Examples
By CEFR Level
- This is too complex for A2 level.
- In science class, we learned that electron transport makes energy for cells.
- Plants also have electron transport in their chloroplasts.
- The Krebs cycle produces molecules that feed into the electron transport chain.
- Without oxygen, the electron transport chain cannot function properly.
- Uncouplers disrupt the proton gradient generated by electron transport, dissipating energy as heat.
- Cytochrome c is a crucial mobile carrier in the mitochondrial electron transport system.
Learning
Memory Aids
Mnemonic
Think of electrons as tiny parcels being passed along a conveyor belt (the chain) to a final destination, powering a pump (the proton pump) as they go.
Conceptual Metaphor
A bucket brigade for energy; a downhill cascade of electrons powering a waterwheel.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate as 'электронный транспорт' (implies transport of electronics). Correct: 'транспорт электронов' or, for the chain, 'дыхательная цепь', 'цепь переноса электронов'.
Common Mistakes
- Using 'electron transportation' (non-standard).
- Confusing 'electron transport' (the process) with 'electron transport chain' (the structure).
- Mispronouncing as 'electrontransport' (run together).
Practice
Quiz
In which cellular compartment does mitochondrial electron transport primarily occur?
FAQ
Frequently Asked Questions
No. Cellular respiration includes glycolysis, the Krebs cycle, AND electron transport. Electron transport is the final, most ATP-productive stage.
The direct result is the pumping of protons (H+) across a membrane, creating an electrochemical gradient (proton motive force).
In mitochondria, no—oxygen is the final electron acceptor. However, some bacteria use other final acceptors (e.g., nitrate) in anaerobic electron transport.
Because electrons are passed sequentially from one protein/coenzyme complex to the next, like links in a chain, each step releasing a small amount of energy.