<prompt> Which is true about stop codon?3 codon coding for one amino acid3 codon coding for whole DNA3 codon coding for whole RNA3 codon act as terminator codon  <response>: Ans. d 3 codon act as terminator codon Stop codons are a normal part of protein synthesis--they are the reason that all proteins do not go on forever.During translation, it is stop codon on mRNA sequence, that terminates the process. Therefore they are known to act as terminator codon. There are three stop codons namely: UAG: Amber UGA: Opal UAA: OchreInitiator codon: In eukaryotes: AUG codes for methionine In prokaryotes: AUG codes for N-Formyl methionine UGA codes for tryptophan in mitochondrial DNA. 