The codon UGA specifies
A) "start" in the "universal" genetic code.
B) the amino acid glycine in human mtDNA.
C) formyl-methionine in mtDNA.
D) both "stop" in the "universal" genetic code and the amino acid tryptophan in human mtDNA.
E) methionine in mtDNA genetic code.

Question

Quizplus · Accepted Answer

The codon UGA is a "stop" codon in the "universal" genetic code, meaning it signals the end of a protein sequence. However, in some organisms (including humans) UGA can also be a coding codon for the amino acid tryptophan in certain contexts.

The Codon UGA Specifies