Spec 1BI0
Revise Edexcel GCSE Biology 3.2 DNA and protein synthesis with the question bank and revision guides.
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 the four different bases attached to the sugar
