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GCSE Biology · key term
One of the two long, continuous chains that form a DNA molecule.
Used by OCR
Specification B1.2b · Paper 1 (Foundation), Paper 3 (Higher)
Revise: DNA structureEach DNA molecule consists of two long strands. These strands wind around one another, producing a spiral shape called a double helix. “Double” tells us that there are two strands, while “helix” describes the coiled shape.
For a complete description, include both the number of strands and their three-dimensional shape: DNA consists of two strands forming a double helix.
Do not describe DNA as a single twisted strand. The word “double” refers to the two strands.
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