Which of the Following Occur During Initiation

Question

Which of the following occur during initiation?  
A) A tRNA containing the methionine codon and a ribosomal unit converge on an mRNA.
B) A tRNA containing a UAA sequence hybridizes to a complementary mRNA sequence.
C) Peptide bonds form between an amino acid and mRNA.
D) Peptide bonds from between a tRNA an mRNA
E) A tRNA containing a lysine codon attaches to an mRNA.

Accepted Answer

During initiation, a ribosomal unit binds to the mRNA and a specific tRNA molecule with the methionine codon (AUG) attaches to the start codon on the mRNA, marking the beginning of translation. Peptide bonds do not form at this stage. Option B is incorrect because UAA is a stop codon and cannot be present at the start of mRNA. Option C is incorrect because peptide bonds do not directly form between an amino acid and mRNA. Option D is incorrect because, although peptide bonds are involved, they do not form between tRNA and mRNA during initiation. Option E is incorrect because lysine (lys) is not the start codon for protein synthesis.