Loading…
Loading…
GCSE Combined Science · key term
The shape formed by two strands wound around each other.
Used by AQA and Edexcel
Specification 4.6.1.3 · Paper 2
Revise: DNA and the GenomeDNA is a polymer, meaning a large molecule built from many smaller repeating units joined together. It consists of two strands twisted around each other into a double helix. Imagine a ladder twisted along its length: this gives a useful picture of the overall shape.
Paper 1, Paper 2
The shape formed by two strands coiled around one another, like a twisted ladder.
Revise: Reproduction and DNADNA consists of two strands coiled around one another to form a double helix. Imagine a ladder twisted along its length. Alternating sugars and phosphate groups form the two sides, called the sugar–phosphate backbones.
Describe DNA as a polymer of two strands forming a double helix, not as two chromosomes twisted together.
Create a free account to read GCSE Combined Science revision notes for your exam board and track your progress.