Home Biology Molecular Basis of Inheritance NCERT Examplar Which of the following is true with respect …
Biology Molecular Basis of Inheritance NCERT Examplar Single Correct MCQ
Published on: August 12, 2026

Which of the following is true with respect to AUG:

A
It codes for methionine only
B
It is an initiation codon
C
It codes for methionine in both prokaryotes and eukaryotes
D
All of the above

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The correct answer is:
NOT AVAILABLE

Polypeptide synthesis is signalled by two initiation codons commonly AUG or methionine codon and rarely GUG or valine codon. Since there are 64 triplet codons and only 20 amino acids, the incorporation of some amino acids must be influenced by more than one codon.
Only tryptophan (UGG) and methionine (AUG) are specified by single codons. AUG codes for methionine in both prokaryotes and eukaryotes.

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