Which codon is the usual start signal for translation and codes for methionine?
Answer and explanation
Correct answer: D. AUG
- Step 1: Translation begins at the first AUG in the mRNA. Step 2. UAA and UGA are stop codons. Answer: AUG. Why not the others: UAA and UGA are termination stop codons that signal release factors to cease polypeptide elongation, while GGC is an internal triplet codon coding for the amino acid glycine.
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