Biology (Separate Science) · GCSE · Edexcel · Edexcel Level 1/Level 2 GCSE (9–1) in Biology (1BI0) (Higher) · Specification point · 3.4 · Genetics
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| Students should: | Maths skills |
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3.4 Describe DNA as a polymer made up of: a two strands coiled to form a double helix b strands linked by a series of complementary base pairs joined together by weak hydrogen bonds c nucleotides that consist of a sugar and phosphate group with one of four different bases attached to the sugar |