Biology · A-Level · Edexcel · Edexcel A-level Biology A (Salters-Nuffield) — 9BN0 · Specification point · 2.5 · Genes and Health
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2.5 i) Know the basic structure of mononucleotides (deoxyribose or ribose linked to a phosphate and a base, including thymine, uracil, cytosine, adenine or guanine) and the structures of DNA and RNA (polynucleotides composed of mononucleotides linked through condensation reactions). ii) Know how complementary base pairing and the hydrogen bonding between two complementary strands are involved in the formation of the DNA double helix. |