BIOL107 Lecture Notes - Lecture 18: Intron, Prokaryote, Ribosomal Rna
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Introns do not contribute any coding information to the eventual protein therefore they must be removed from mrna prior to translation: part of genetic coding from dna that is not necessary, can vary in size, depending on particular gene and organism, size can range from 50 nucleotides to several thousand nucleotides, number of introns varies from 0 to ~100, sequences containing genetic info are called exons, ref web fig. Initial information regarding this process came from experiments by francis crick and sydney brenner: they showed that the genetic code is a triplet code = 3 adjacent nucleotides (codon) in mrna specify one amino acid i. e. : uug = one codon consisting of 3 bases to code for one protein, translation requires, ribosomes, mrna, 20 amino acids found in proteins, a full set of trna"s, a full set of enzymes called amino acyl trna synthases =