Translation Practice Test

During translation, a ribosome begins at a start codon and reads an mRNA 5′→3′ in sets of three nucleotides. A student compares two mRNAs that are identical except at codon 4: mRNA 1 has 5′-AUG GCU UAC GAA CCG-3′, and mRNA 2 has 5′-AUG GCU UAC UAA CCG-3′. In this system, UAA is a stop codon recognized by a release factor rather than a tRNA. All other codons shown are sense codons that recruit tRNAs carrying amino acids. Which outcome is most likely for translation of mRNA 2 compared with mRNA 1?

During translation, a ribosome begins at the start codon and reads mRNA in groups of three nucleotides (codons). A student provides an mRNA segment: 5′-AUG GCU UAC GAA UGA-3′. The tRNA carrying methionine binds the start codon, and each subsequent codon is matched by a tRNA with a complementary anticodon, adding one amino acid per codon. Translation ends when a stop codon enters the ribosome, and no tRNA binds that codon. Assume this segment is in-frame and is translated without skipping or editing. Which outcome is most likely for the polypeptide produced from this mRNA segment?