uracil
Low (Highly specialized technical term)Technical/Scientific
Definition
Meaning
A nitrogenous base found in RNA, one of the four fundamental building blocks of the genetic molecule, where it pairs with adenine.
A pyrimidine derivative (C₄H₄N₂O₂) that replaces thymine in RNA, playing a critical role in coding, decoding, regulation, and expression of genes.
Linguistics
Semantic Notes
Exclusively used in biochemistry, molecular biology, and genetics. It denotes a specific chemical compound and has no metaphorical or everyday uses.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or usage differences. Spelling and pronunciation are consistent.
Connotations
Identical, purely denotative scientific term.
Frequency
Equally low frequency and confined to identical technical contexts in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
[uracil] is present in [RNA][Enzyme] modifies [uracil]The [base] [uracil] pairs with [adenine]Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Virtually never used.
Academic
Core term in life sciences, especially in papers on transcription, RNA biology, and nucleic acid chemistry.
Everyday
Not used in everyday conversation.
Technical
Fundamental term in lab protocols, genetic research, pharmaceutical development (e.g., antisense oligonucleotides), and textbooks.
Examples
By Part of Speech
adjective
British English
- The uracil component was analysed.
- A uracil-derived compound
American English
- The uracil component was analyzed.
- A uracil-based probe
Examples
By CEFR Level
- Uracil is a part of RNA.
- In RNA, the base uracil replaces thymine.
- Scientists can track uracil incorporation to measure RNA synthesis rates.
- The deamination of cytosine to uracil is a common mutagenic event, which necessitates robust DNA repair mechanisms.
Learning
Memory Aids
Mnemonic
Think: "You-R-ACIL" in RNA. 'U' is for Uracil, and it's found in RNA, while 'T' for Thymine is in DNA.
Conceptual Metaphor
Building block / letter of the genetic alphabet.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with "урацил" which is a direct and correct translation. No trap, but the Russian term is equally technical.
Common Mistakes
- Mispronouncing as 'yoo-RA-sil' (stress error).
- Confusing it with thymine and using it in the context of DNA.
- Misspelling as 'urasil' or 'urascil'.
Practice
Quiz
Uracil is a characteristic component of which biomolecule?
FAQ
Frequently Asked Questions
Uracil is one of the four nucleobases in RNA. It base-pairs with adenine during transcription and translation, helping to carry genetic information from DNA to protein synthesis.
Typically, no. DNA uses thymine instead of uracil. The presence of uracil in DNA usually indicates damage (e.g., from cytosine deamination) and is removed by repair enzymes.
Chemically, thymine has a methyl group (CH₃) that uracil lacks. Functionally, thymine is standard in DNA, while uracil is standard in RNA.
The use of thymine in DNA provides greater chemical stability and allows repair systems to easily identify uracil in DNA as a mistake, maintaining genetic fidelity.