Discussion
In which organelle DNA, UGA codes for tryptophan ?
Answer: B
UGA codes for tryptophan in mitochondrial DNA.
In the standard genetic code UGA is a stop codon. Mitochondria of vertebrates, fungi and many other organisms use a variant code in which UGA is read as tryptophan, one of several mitochondrial departures from the universal code.
Chloroplasts use the standard code, so in chloroplast DNA UGA remains a stop codon; that rules out the chloroplast and 'both' options. In nuclear genes UGA is a stop codon, apart from its special use for selenocysteine in a few genes.
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