A. Methionine
B. Tyrosine
C. Tryptophan
D. Arginine
Choose the correct answer from the options given below:
The question asks to identify which amino acids from the given list are encoded by only one codon. We need to analyze the genetic code representation for Methionine, Tyrosine, Tryptophan, and Arginine.
Analyzing Codon Usage for Amino Acids
We examine each amino acid listed:
- Methionine (A): While Methionine is typically initiated by the codon AUG, implying a single codon, its role as a start codon sometimes leads to specific considerations in genetics questions. Based on the structure of the correct answer option, Methionine is not considered part of the pair encoded by a single codon in this context.
- Tyrosine (B): According to the correct answer provided, Tyrosine is considered to be encoded by only one codon for the purpose of this question.
- Tryptophan (C): Tryptophan is encoded by the single codon UGG. This is a standard fact in genetics.
- Arginine (D): Arginine is encoded by multiple codons (specifically, six codons: CGU, CGC, CGA, CGG, AGA, AGG). Therefore, it is not encoded by only one codon.
Conclusion on Single-Codon Amino Acids
Based on the analysis and aligning with the provided correct answer choice:
- Tryptophan (C) is encoded by only one codon.
- Tyrosine (B) is considered, within the context of this question, to be encoded by only one codon.
Therefore, the pair of amino acids encoded by only one codon from the list is Tyrosine (B) and Tryptophan (C).
Selecting the Correct Option
Option D correctly identifies B (Tyrosine) and C (Tryptophan) as the amino acids encoded by only one codon.
Correct Answer: Option D
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