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what is a codon
triplet
3 rules of genetics
degenerate
non overlapping
universal
degenerate
single amino acid may be coded for by more than one codon
non overlapping
each base is only read once
universal
each triplet codes for the same amino acid in all organisms
direction of codon
always read in one particular direction along DNA strand
start codon
methionine
what marks end of polypeptide chain
3 stop codons
what are non coding sections
eukaryotes contain non coding sections of multiple repeats of base sequences between genes that do no code for amino acids
introns
sections that do not code for amino acid
extrons
sections that do code for amino acid
