Question:
Select the option that has only termination codons.
Select the option that has only termination codons.
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Stop codons are UAA, UAG and UGA. Every other triplet codes for an amino acid.
Updated On: Oct 23, 2026
- UAA, UGA, UAG
- UAA, UUU, UGG
- UAA, UAG, UAC
- UUU, UCC, UGG
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The Correct Option is A
Solution and Explanation
Step 1: Recall the genetic code:
The genetic code has 64 codons. Sixty-one of them code for amino acids. Three do not code for any amino acid.
These three are the stop or termination codons: UAA, UAG and UGA.
Step 2: Check each option:
(A) UAA, UGA and UAG are all stop codons. So (A) is correct.
(B) UUU codes for phenylalanine and UGG codes for tryptophan. So it is wrong.
(C) UAC codes for tyrosine. So it is wrong.
(D) UUU is phenylalanine, UCC is serine and UGG is tryptophan. None is a stop codon, so it is wrong.
Final Answer:
Only option (A) lists three stop codons: UAA, UGA and UAG.
The genetic code has 64 codons. Sixty-one of them code for amino acids. Three do not code for any amino acid.
These three are the stop or termination codons: UAA, UAG and UGA.
Step 2: Check each option:
(A) UAA, UGA and UAG are all stop codons. So (A) is correct.
(B) UUU codes for phenylalanine and UGG codes for tryptophan. So it is wrong.
(C) UAC codes for tyrosine. So it is wrong.
(D) UUU is phenylalanine, UCC is serine and UGG is tryptophan. None is a stop codon, so it is wrong.
Final Answer:
Only option (A) lists three stop codons: UAA, UGA and UAG.
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