Triplet Code

what is a codon

sequence of 3 bases in mRNA corresponding to amino acid

what is triplet code

sequence of 3 bases on DNA that code for amino acid in translation

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