An mRNA sequence is 5'AUG-GGC-ACU-CAU-ACU-UAA3'F10,where AUG is the start codon and UAA is the stop codon.How many distinct aminoacyl-tRNA synthetases are required to translate the mRNA sequence?

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Quizplus · Accepted Answer

The mRNA sequence contains four codons (AUG, GGC, ACU, CAU) that code for amino acids before the stop codon (UAA). Each codon specifies an amino acid, but ACU and CAU both code for different amino acids, requiring distinct tRNAs and therefore distinct aminoacyl-tRNA synthetases. Since AUG codes for Methionine, GGC for Glycine, and ACU and CAU for Threonine and Histidine respectively, four distinct aminoacyl-tRNA synthetases are needed.

An MRNA Sequence Is 5'AUG-GGC-ACU-CAU-ACU-UAA3'F10,where AUG Is the Start Codon