Most amino acids have more than one codon and attach to more than one tRNA, each

Question

Most amino acids have more than one codon and attach to more than one tRNA, each with a different anticodon. Additionally, the anticodons of some tRNAs recognize more than one codon of the same amino acid. The amino acid alanine has four codons, (5')GCU, GC?, GCA, and GCG. Select the anticodons that will recognize more than one codon for alanine. (5') IGO (5') UGC (5) CGU (5) CGC (5') UGU Incorrect. At least one of your choices is incorrect. In the 5' to 3' direction the third base of the anticodon base pairs with first base of the codon. The last two bases of the anticodon form canonical Watson-Crick base pairs with the first two bases of the codon. The first base in the anticodon is considered the wobble base. Even in the wobble position, bases A and C can only form Watson-Crick base pairs.

Explanation / Answer

The codons of alanine: 5' GCU GCC GCA GCG

Anticodons of tRNA:   3' CGA CGG CGU CGC 5'

Therefore, the correct options are CGU (5') and CGC (5') . Options 3 and 4 are correct.

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