operon
C2Technical/Scientific
Definition
Meaning
A functional unit of DNA in bacteria containing a cluster of genes under the control of a single promoter.
A genetic regulatory system, primarily in prokaryotes, where genes with related functions are transcribed together. The concept is foundational in molecular biology for understanding gene regulation.
Linguistics
Semantic Notes
The term is highly specialized and used almost exclusively in genetics, microbiology, and molecular biology. It is not used metaphorically or in general language.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or spelling. Pronunciation may differ slightly.
Connotations
None beyond its strict scientific definition.
Frequency
Extremely low frequency in general discourse but standard in relevant scientific fields in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The [named] operon (e.g., lac operon) is regulated by...Genes within an operon are co-transcribed.The operon model explains...Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Not used.
Academic
Core concept in genetics and molecular biology textbooks and research papers.
Everyday
Virtually never used.
Technical
Essential term for describing prokaryotic gene regulation.
Examples
By Part of Speech
adjective
British English
- operon-based regulation
- operon-like structure
American English
- operon-controlled genes
- operon-specific factors
Examples
By CEFR Level
- The lac operon was a groundbreaking discovery in genetics.
- Bacteria often organise related genes into an operon.
- Regulation of the trp operon involves a repressor protein and an attenuator mechanism.
- The polycistronic mRNA produced from an operon allows for coordinated expression of enzyme families.
Learning
Memory Aids
Mnemonic
Think OPERation ON: a group of genes operating together, turned ON or OFF as a single unit.
Conceptual Metaphor
A factory production line where a single switch (promoter) controls the simultaneous activation of multiple connected machines (genes) to make a product.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'операция' (operation).
- The Russian term is 'оперон' – a direct transliteration.
Common Mistakes
- Using it to refer to eukaryotic gene regulation (operons are primarily prokaryotic).
- Pronouncing it as 'oh-per-on' (stress is on the first syllable).
- Using it as a general term for any gene.
Practice
Quiz
What is an operon?
FAQ
Frequently Asked Questions
No, operons are primarily a feature of prokaryotic genomes (bacteria and archaea). Eukaryotic genes are typically regulated independently.
The operon model was proposed by François Jacob and Jacques Monod in 1961, based on their work on the lac operon in E. coli.
An operon is a set of adjacent genes controlled by a single promoter. A regulon is a set of genes or operons scattered throughout the genome but regulated by a common factor.
Yes, the mRNA transcribed from an operon is polycistronic, meaning it contains coding sequences for multiple proteins, which are translated separately.