DNA Structure (Edexcel IGCSE Biology)
Revision Note
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The Structure of DNA
DNA, or deoxyribonucleic acid, is the genetic material found in the nucleus of a cell
DNA, is a polymer made up of two strands coiled around to make a double helix
The strands are formed from a sugar phosphate backbone with bases:
Adenine (A)
Thymine (T)
Guanine (G)
Cytosine (C)
The bases are bonded together by complementary base pairing
A pairs with T
G pairs with C
Cell division and protein synthesis both rely on these base-pairing rules because each half of the DNA double helix acts as a template to be copied to create a completely new double helix
The structure of DNA and complementary base pairs
Examiner Tips and Tricks
You are expected to know the names of each base so do make sure you use these appropriately in exam answers, rather than just relying on the abbreviated letters.
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