Question 46 (1 point) An elongating ribosome is bound to appropriate tRNAs in both the A and the P sites and is ready for peptidyl transfer. Which of the following happens next? The carboxyl end of the amino acid is released from the A-site tRNA and joined to the free amino group of the polypeptide chain linked to the P-site tRNA. The amino end of the polypeptide chain is released from the P-site tRNA and joined to the free carboxyl group of the amino acid linked to the A-site tRNA. The carboxyl end of the polypeptide chain is released from the P-site tRNA and joined to the free amino group of the amino acid linked to the A-site tRNA. The amino end of the amino acid is released from the A-site tRNA and joined to the free carboxyl group of the polypeptide chain linked to the P-site tRNA.
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A ribosome has a tRNA in its P site that is attached to a polypeptide. The ribosome's A site is sitting over a stop codon. What will happen next? The stop amino acid will be added to the polypeptide chain, and the polypeptide will be released. A terminator tRNA will bind in the A site of the ribosome, and the polypeptide will be released. A protein called a release factor will bind to the A site and the bond between the tRNA in the P site and the polypeptide chain will be hydrolyzed. The ribosome will shift three nucleotides toward the 3' end of the mRNA to expose the next codon in the A site
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Dominador T.
$\begin{array}{|c|c|}\hline \text { Codon on mRNA } & {\text { Amino Acid }} \\ \hline \mathbf{G C A} & {\text { alanine }} \\ \hline \mathbf{A A G} & {\text { lysine }} \\ \hline \mathbf{G U U} & {\text { valine }} \\ \text { AAU } & {\text { asparagine }} \\ \hline \mathbf{U G C} & {\text { cysteine }} \\ \hline \mathbf{U C G} & {\text { serine }} \\ \hline \mathbf{U C U} & {\text { serine }} \\ \hline \text { UUA } & {\text { leucine }} \\ \hline \text { UAA } & {\text { stop }} \\ \hline\end{array}$ You are given three mRNA sequences: 1. 5’-UCG-GCA- AAU-UUA -GUU-3’ 2. 5’-UCU-GCA- AAU-UUA -GUU-3’ 3. 5’-UCU-GCA- AAU-UAA -GUU-3’ Using the table, write the peptide encoded by each of the mRNA sequences. a. 1. Serine-alanine-asparagine-leucine-valine 2. Serine-alanine-asparagine-leucine-valine 3. Serine-alanine-asparagine(-stop) b. 1. Serine-phenylalanine-asparagine-leucinevaline 2. Serine-alanine-asparagine-leucine-valine 3. Serine-alanine-asparagine (-stop) c. 1. Serine-alanine-asparagine-leucine-valine 2. Serine-alanine-asparagine (-stop) 3. Serine-alanine-asparagine-leucine-valine d. 1. Serine-alanine-asparagine-leucine-valine 2. Serine-arginine-asparagine-leucine-valine 3. Serine-alanine-asparagine(-stop)
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