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Deoxyribonucleic acid (DNA) carries the genetic instructions for the development, functioning, and reproduction of all known living organisms. Understanding how DNA encodes information, how it replicates, and how that information is expressed as proteins — as well as how gene expression is regulated — is central to A-Level Biology.
Key Definition: A gene is a sequence of DNA nucleotides that codes for a functional polypeptide (or functional RNA molecule such as tRNA or rRNA).
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