chemiosmosis: meaning, definition, pronunciation and examples
C2Academic, Scientific, Technical
Quick answer
What does “chemiosmosis” mean?
The movement of ions, typically protons, across a semipermeable membrane down their electrochemical gradient, coupled to the synthesis of ATP.
Audio
Pronunciation
Definition
Meaning and Definition
The movement of ions, typically protons, across a semipermeable membrane down their electrochemical gradient, coupled to the synthesis of ATP.
A mechanism by which cells generate adenosine triphosphate (ATP) for energy, central to cellular respiration and photosynthesis.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning. Spelling and pronunciation are consistent.
Connotations
Exclusively technical and neutral.
Frequency
Extremely low frequency outside specific scientific discourse (biology, biochemistry).
Grammar
How to Use “chemiosmosis” in a Sentence
The [noun phrase] relies on chemiosmosis.Chemiosmosis is used to generate [noun phrase].Vocabulary
Collocations
Examples
Examples of “chemiosmosis” in a Sentence
noun
British English
- Peter Mitchell was awarded the Nobel Prize for his chemiosmosis hypothesis.
- The efficiency of the Krebs cycle depends on subsequent chemiosmosis.
American English
- The chapter on cellular energetics explains chemiosmosis in detail.
- ATP synthase is the enzyme complex that exploits chemiosmosis.
Usage
Meaning in Context
Business
Not used.
Academic
Central concept in university-level biology and biochemistry textbooks and research papers.
Everyday
Virtually never used.
Technical
Core term in discussions of bioenergetics, mitochondrial function, and photosynthesis.
Vocabulary
Synonyms of “chemiosmosis”
Strong
Neutral
Weak
Vocabulary
Antonyms of “chemiosmosis”
Watch out
Common Mistakes When Using “chemiosmosis”
- Using it as a countable noun (e.g., 'a chemiosmosis').
- Confusing it with simple diffusion or osmosis.
- Misspelling as 'chemiosmoses'.
FAQ
Frequently Asked Questions
No. Osmosis is the diffusion of water across a membrane. Chemiosmosis is the movement of ions (protons) down an electrochemical gradient, which is then used to power a molecular machine (ATP synthase).
It occurs across the inner mitochondrial membrane in animal cells and the thylakoid membrane in plant chloroplasts.
The British biochemist Peter Mitchell proposed the chemiosmotic hypothesis in 1961, for which he received the Nobel Prize in Chemistry in 1978.
While most famously linked to aerobic respiration, the principle of chemiosmosis is also used in some forms of anaerobic respiration and photosynthesis. It requires an electron transport chain to establish the proton gradient.
The movement of ions, typically protons, across a semipermeable membrane down their electrochemical gradient, coupled to the synthesis of ATP.
Chemiosmosis is usually academic, scientific, technical in register.
Chemiosmosis: in British English it is pronounced /ˌkiːmɪəʊˈsməʊsɪs/, and in American English it is pronounced /ˌkɛmioʊˈsmoʊsɪs/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “The powerhouse of the cell relies on chemiosmosis.”
Learning
Memory Aids
Mnemonic
CHEMIcal OsmOSIS: Think of chemicals (protons) undergoing a kind of osmosis across a membrane to create energy.
Conceptual Metaphor
A water wheel or turbine driven by a flow of protons, generating energy currency (ATP).
Practice
Quiz
Chemiosmosis is a fundamental process in which cellular activities?