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GCSE Combined Science · key term
A subunit of DNA consisting of a sugar, a phosphate group and one of four bases attached to the sugar.
Used by Edexcel
Paper 1, Paper 2
Revise: Reproduction and DNADNA is a polymer: a large molecule made from many repeating subunits. Its subunits are called nucleotides. Each nucleotide contains a sugar and a phosphate group, with one base attached to the sugar.
Keep the structures distinct: a nucleotide is a DNA subunit; a gene is a section of DNA; the genome is the organism’s entire DNA.
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