double helix
C2Scientific/Technical
Definition
Meaning
The twisted-ladder structure of a DNA molecule, consisting of two parallel strands of nucleotides coiled around a common axis.
A shape consisting of two parallel helices intertwined about a common axis, resembling the structure of DNA. Can be used metaphorically for anything that is intertwined, interwoven, or spiraled in two parallel strands.
Linguistics
Semantic Notes
Primarily a technical/scientific term. Rarely used literally outside of molecular biology contexts. Its metaphorical use is often stylized or poetic.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Pronunciation differs slightly.
Connotations
Identical strong connotations with science, genetics, and discovery. Associated with Watson & Crick and mid-20th century breakthroughs.
Frequency
Equally low-frequency in general discourse, but a standard high-frequency term in genetics, molecular biology, and biochemistry in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The double helix of [DNA/genetic material][Watson/Crick] described the double helix.The molecule forms a double helix.Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Virtually never used. Potential metaphorical use in branding for biotech companies (e.g., 'Double Helix Therapeutics').
Academic
Core technical term in life sciences. Used literally in biology, genetics, biochemistry papers. Occasionally used metaphorically in humanities to describe intertwined narratives or concepts.
Everyday
Rare. Understood by most educated adults due to its fame, but not used in casual conversation. Might appear in science documentaries or news articles about genetics.
Technical
Precise, literal term for the secondary structure of DNA. The default term in molecular biology.
Examples
By Part of Speech
adjective
British English
- The double-helix structure was revolutionary.
- They proposed a double-helix model for the polymer.
American English
- The double-helix configuration is iconic.
- We studied the double-helix architecture of the molecule.
Examples
By CEFR Level
- DNA looks like a double helix.
- Scientists discovered the double helix shape of DNA in 1953.
- The double helix is like a twisted ladder.
- The stability of the DNA double helix is crucial for genetic information storage.
- Watson and Crick famously described the molecular structure as a double helix.
- The metaphorical double helix of cultural and economic forces shaped the city's development.
- Advanced imaging techniques now allow us to observe the double helix dynamics in supercoiled DNA within live cells.
Learning
Memory Aids
Mnemonic
Imagine two snakes (the strands) coiled around the same pole (the axis), forming a twisted ladder (the base pairs as rungs).
Conceptual Metaphor
THE BLUEPRINT OF LIFE IS A TWISTED LADDER; INTERCONNECTED DESTINIES ARE A DOUBLE HELIX.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid calquing as 'двойная спираль' for metaphorical uses where it sounds unnatural. In Russian, 'двойная спираль' is almost exclusively used for DNA, not for abstract intertwined concepts.
- Do not confuse with 'helix' alone, which is 'винтовая линия' or 'спираль'. 'Double helix' is a fixed compound term.
Common Mistakes
- Using 'double helix' to describe a single spiral (like a spring or a corkscrew).
- Incorrectly capitalising it as a proper noun (unless part of a specific company/model name, e.g., the Double Helix model).
- Using it as a countable noun incorrectly (e.g., 'a double helix' is correct for one DNA molecule; 'double helices' for multiple).
Practice
Quiz
In which field is the term 'double helix' primarily used?
FAQ
Frequently Asked Questions
James Watson and Francis Crick, with crucial contributions from Rosalind Franklin's X-ray diffraction data, are credited with the discovery and modelling of the DNA double helix in 1953.
No, 'double helix' is exclusively a noun (and a compound adjective when hyphenated). There is no standard verb form.
Primarily, yes. While other molecules can form double helical structures, the term is overwhelmingly associated with DNA. Any other use is either a direct analogy or a metaphorical extension.
The two 'strands' are backbones made of sugar and phosphate molecules. The 'rungs' are pairs of nitrogenous bases (adenine-thymine or guanine-cytosine) that hold the strands together via hydrogen bonds.