Question:
Which of the following amino acids does NOT have a degenerative codon?
Which of the following amino acids does NOT have a degenerative codon?
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Non-degenerate Amino Acids (Encoded by ONLY 1 codon): Methionine (AUG) and Tryptophan (UGG). All others have 2 to 6 codons.
Updated On: Sep 4, 2026
- Histidine
- Leucine
- Methionine
- Valine
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
The standard genetic code is degenerate (redundant), where multiple synonymous codons specify the same amino acid, with only two singular exceptions.
Step 2: Detailed Explanation:
Analyzing codon redundancy in the genetic code:
1. Methionine (Met M): Encoded exclusively by a single unique initiation triplet codon, AUG.
2. Tryptophan (Trp W): Encoded exclusively by UGG.
3. All other 18 standard amino acids have degenerate codons (e.g., Leucine has 6 codons, Valine has 4 codons, Histidine has 2 codons).
Therefore, Methionine does not have a degenerate codon.
Step 3: Final Answer:
Hence, Methionine does NOT have a degenerative codon, matching option (C).
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