The structure of DNA and RNA, complementary base pairing, replication, and transcription and translation.
DNA carries the genetic code; protein synthesis turns that code into the proteins that build and run the cell.
DNA structure
DNA is a double helix of two strands of nucleotides (each = phosphate + deoxyribose sugar + base). Bases pair by complementary base pairing: A–T and C–G, held by hydrogen bonds.
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