Statement I : The codon ‘AUG’ codes for methionine and phenylalanine.
Statement II : ‘AAA’ and ‘AAG’ both codons code for the amino acid lysine.
In the light of the above statements, choose the correct answer from the options given below.
Correct Answer :
Statement I is incorrect but Statement II is true
Solution :
To determine the correctness of the given statements, let us analyze the specific codons and the amino acids they code for:
Analysis of Statement I:
The codon AUG exhibits a dual function in molecular biology. First, it serves as the initiation (start) codon that signals the beginning of translation. Second, it codes for the amino acid methionine. It does not code for phenylalanine, which is coded by the codons UUU and UUC. Therefore, Statement I is incorrect.
Analysis of Statement II:
The genetic code is degenerate, meaning that most amino acids are specified by more than one codon. The amino acid lysine is coded by two codons: AAA and AAG. Therefore, Statement II is true.
Conclusion: Statement I is incorrect but Statement II is true.
Access expert-curated educational resources and study materials—completely free.
Create, conduct, and manage professional online assessments with Mindyard. Perfect for teachers and institutes.
Copyright © 2026 Mindyard. All Rights Reserved.
 Set - 3-1782888548748.webp)
