tricarboxylic acid cycle: meaning, definition, pronunciation and examples
Very LowTechnical / Scientific
Quick answer
What does “tricarboxylic acid cycle” mean?
A cyclic series of biochemical reactions in aerobic organisms, where acetyl-CoA is oxidized to produce energy, primarily ATP, along with carbon dioxide and water.
Audio
Pronunciation
Definition
Meaning and Definition
A cyclic series of biochemical reactions in aerobic organisms, where acetyl-CoA is oxidized to produce energy, primarily ATP, along with carbon dioxide and water.
Also known as the Krebs cycle or citric acid cycle, this metabolic pathway occurs in the mitochondrial matrix and is central to cellular respiration, linking carbohydrate, fat, and protein metabolism to produce high-energy electron carriers (NADH, FADH₂) for the electron transport chain.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or conceptual differences. Spelling and pronunciation follow standard national conventions.
Connotations
Purely scientific/technical term with no regional connotative differences.
Frequency
Equally rare and specialized in both dialects, used exclusively in academic, research, and medical contexts.
Grammar
How to Use “tricarboxylic acid cycle” in a Sentence
The [SUBJECT] undergoes the tricarboxylic acid cycle.The tricarboxylic acid cycle occurs in [LOCATION].[ENZYME] catalyzes a step in the tricarboxylic acid cycle.Vocabulary
Collocations
Examples
Examples of “tricarboxylic acid cycle” in a Sentence
adjective
British English
- TCA cycle intermediates
- tricarboxylic acid cycle enzymes
American English
- TCA cycle activity
- tricarboxylic acid cycle function
Usage
Meaning in Context
Academic
Essential term in biochemistry, physiology, and medical textbooks. Used in research papers on metabolism, bioenergetics, and mitochondrial function.
Everyday
Virtually never used in everyday conversation.
Technical
Core terminology in laboratory protocols, metabolic engineering, clinical discussions of metabolic disorders, and pharmaceutical research targeting metabolism.
Vocabulary
Synonyms of “tricarboxylic acid cycle”
Watch out
Common Mistakes When Using “tricarboxylic acid cycle”
- Misspelling as 'tricarbonic acid cycle'.
- Confusing it solely with 'glycolysis' (which precedes it) or the 'electron transport chain' (which follows it).
- Using the term in non-biological contexts.
FAQ
Frequently Asked Questions
Acetyl-CoA, derived from the breakdown of carbohydrates, fats, and proteins.
In the mitochondrial matrix of eukaryotic cells, and in the cytosol of prokaryotes.
Hans Adolf Krebs, for which it is often named the Krebs cycle. He was awarded the Nobel Prize in Physiology or Medicine in 1953 for this discovery.
For each acetyl-CoA oxidized, the cycle directly produces one GTP (or ATP) and, more importantly, reduces three NAD+ to NADH and one FAD to FADH₂, which then fuel the electron transport chain.
A cyclic series of biochemical reactions in aerobic organisms, where acetyl-CoA is oxidized to produce energy, primarily ATP, along with carbon dioxide and water.
Tricarboxylic acid cycle is usually technical / scientific in register.
Tricarboxylic acid cycle: in British English it is pronounced /ˌtraɪ.kɑːˌbɒk.sɪl.ɪk ˈæs.ɪd ˈsaɪ.kəl/, and in American English it is pronounced /ˌtraɪ.kɑːrˌbɑːk.sɪl.ɪk ˈæs.ɪd ˈsaɪ.kəl/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Citrate Is Krebs' Starting Substrate For Making Oxaloacetate: C (Citrate) I (Isocitrate) K (α-Ketoglutarate) S (Succinyl-CoA) S (Succinate) F (Fumarate) M (Malate) O (Oxaloacetate).
Conceptual Metaphor
The cell's power plant's 'chemical wheel' or 'energy extraction conveyor belt' that spins acetyl groups to harvest their energy.
Practice
Quiz
Which of the following is NOT a synonym for the tricarboxylic acid cycle?