Exception of genetic code is/are:
UUU code for phenylalanine in bacteria
Mitochondrial codons
Protozoans (some)
All of these
Salient features of genetics code -
The code is nearly universe eg; from bactria it human, UUU would code for phenylalanine. Some exception are found in mitochondrial codons, and in some protozoans.
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Correct option is 4