Genes & the Genetic Code (AQA A-Level Biology): Flashcards

DNA section with coded info for polypeptides & functional RNA

Particular position a gene occupies on a DNA molecule

$4^3 = 64$ combinations, enough for 20 amino acids

Unit of three bases coding for one amino acid

Most amino acids coded by more than one triplet

Triplet coding for methionine

Three triplets that mark end of polypeptide chain

Each base in sequence read only once

Each triplet codes for same amino acid in all organisms (with minor exceptions)

Exons code for amino acids; introns are non-coding sequences