Question

AUG codes for

• A. valine
• B. histidine
• C. phenylalanine
• D. methionine.

Answer 1

Answer: (D)

Initiation codon in prokaryotes as well as eukaryotes is AUG which codes for $N$ - Formylmethionine in prokaryotes and methionine in eukaryotes. GUG which normally codes for valine also used as initiation codon as coding methionine or $N$- Formylmethionine when AUG is not available. UAA and UGA are stop codons.