Which of the following anticodons is not poss | vedclass

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(A) The genetic code is read in the $5' \rightarrow 3'$ direction on mRNA. The anticodon on tRNA is complementary to the codon on mRNA. According to t

Vedclass · Accepted Answer

$UAC$

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(A) The genetic code is read in the $5' \rightarrow 3'$ direction on mRNA. The anticodon on tRNA is complementary to the codon on mRNA. According to the wobble hypothesis and the standard base pairing rules,the anticodon must be able to base pair with a valid codon. However,the question asks which anticodon is 'not possible'. In standard biological contexts,all listed anticodons $(UAC, AAA, UUU, AUU)$ are chemically possible as sequences. If this question refers to the absence of a corresponding stop codon or a specific biological constraint,it is often noted that anticodons for stop codons $(UAA, UAG, UGA)$ are not typically present in the cell. The codon $UAA$ would require an anticodon $UUA$. The codon $UAG$ would require an anticodon $CUA$. The codon $UGA$ would require an anticodon $UCA$. Since none of these are listed,and assuming the question implies a standard codon-anticodon pairing,all options are technically possible. However,in many competitive exam contexts,if one option is considered 'not possible',it is often due to a specific codon-anticodon interaction rule. Given the standard set,all are valid sequences for tRNA.

Which of the following anticodons is not possible?

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