nitrogen base
C1/C2Technical/Scientific
Definition
Meaning
A nitrogenous molecule that serves as a fundamental component of nucleic acids (DNA and RNA) and can accept a hydrogen ion (proton).
Any organic compound containing a nitrogen atom that has the chemical properties of a base, including being a key structural component in nucleotides (adenine, guanine, cytosine, thymine, uracil) and playing critical roles in genetic coding, protein synthesis, and energy transfer (e.g., ATP).
Linguistics
Semantic Notes
The term is primarily used in biochemistry and molecular biology. It has a precise, technical meaning and is not used metaphorically. In the context of nucleic acids, 'base' refers specifically to the purine or pyrimidine component, not the entire nucleotide.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or usage differences. Spelling and pronunciation follow standard UK/US conventions for the component words.
Connotations
Identical technical/scientific connotations in both variants.
Frequency
Equally low-frequency in general discourse but standard in scientific contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The nitrogen base [adenine] pairs with [thymine].A nucleotide consists of a [sugar], a [phosphate], and a [nitrogen base].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None”
Usage
Context Usage
Business
Virtually never used, except in biotech/pharma company reports.
Academic
Core term in biochemistry, genetics, and molecular biology textbooks and research.
Everyday
Extremely rare. Might be encountered in popular science articles about DNA.
Technical
Essential, precise term for describing the structure of nucleic acids and nucleotides.
Examples
By Part of Speech
adjective
British English
- The nitrogen-base composition was analysed.
- It's a key nitrogen-base component.
American English
- The nitrogen-base composition was analyzed.
- It's a key nitrogen-base component.
Examples
By CEFR Level
- DNA has four different nitrogen bases.
- Adenine and thymine are complementary nitrogen bases in DNA.
- The sequence of nitrogen bases in a gene determines the protein it codes for.
- Researchers are investigating how modifications to the nitrogen bases, such as methylation, can regulate gene expression without altering the underlying sequence.
Learning
Memory Aids
Mnemonic
Think of the 'base' in a nucleotide as the 'building block with nitrogen' that forms the genetic 'code letters' (A, T, C, G, U).
Conceptual Metaphor
The nitrogen bases are often metaphorically described as the 'letters' or 'rungs' in the 'ladder' of the DNA double helix.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation to 'азотное основание' as the primary term; 'азотистое основание' is the standard Russian equivalent in biochemistry.
- Do not confuse with the broader chemical term 'основание' (base), as 'nitrogen base' is a specific biochemical concept.
Common Mistakes
- Using 'nitrogen base' to refer to ammonia or other simple nitrogen-containing bases outside the context of nucleotides.
- Saying 'DNA is made of nitrogen bases' instead of the more accurate 'DNA nucleotides contain nitrogen bases.'
Practice
Quiz
Which of the following is NOT a nitrogen base found in DNA?
FAQ
Frequently Asked Questions
Adenine (A), Guanine (G), Cytosine (C), Thymine (T - found in DNA), and Uracil (U - found in RNA).
No. Nitrogen bases are components of nucleotides (DNA/RNA). Amino acids are the building blocks of proteins. They are different types of biomolecules.
They are called bases because they are basic (alkaline) in a chemical sense; their nitrogen atoms can accept a hydrogen ion (proton).
No. A nucleotide includes a nitrogen base, a sugar, and at least one phosphate group. The nitrogen base is just one part of it.