Which of the following events occurs during translocation? A) The peptidyl-tRNA moves from the A site to the P site B) The ribosome moves one codon along mRNA so that a new codon is positioned in the A site C) The empty tRNA moves from the P site to the E site and then leaves the ribosome D) All of the above
Question
Which of the following events occurs during translocation? A) The peptidyl-tRNA moves from the A site to the P site B) The ribosome moves one codon along mRNA so that a new codon is positioned in the A site C) The empty tRNA moves from the P site to the E site and then leaves the ribosome D) All of the above
Solution
D) All of the above
During translocation in protein synthesis, all of the events listed occur.
A) The peptidyl-tRNA moves from the A site to the P site: This is the first step of translocation. The tRNA that was in the A site, carrying the growing peptide chain, moves to the P site.
B) The ribosome moves one codon along mRNA so that a new codon is positioned in the A site: After the peptidyl-tRNA moves to the P site, the ribosome shifts along the mRNA by one codon. This brings a new codon into the A site, ready for the next round of protein synthesis.
C) The empty tRNA moves from the P site to the E site and then leaves the ribosome: The tRNA that was in the P site, now without an amino acid, moves to the E site before exiting the ribosome. This makes room for the next tRNA molecule to enter the A site.
So, the correct answer is D) All of the above.
Similar Questions
During the process of translation:Select one:a. The incoming tRNA must first bind to the E siteb. Initiation begins with the binding of the ribosomal larger subunit to the polyA tail of the mRNAc. The peptide is passed from tRNA in the P site to the tRNA at the A sited. The mRNA is translated by one ribosome at a time
During the mRNA translation, in what site of the ribosome binds the incoming tRNA molecule carrying the amino acid that will be added to the growing polypeptide chain? Z-site E-site W-site P-site A-site
Which of the following steps is part of the elongation cycle in translation? A) Aminoacyl-tRNA binding B) Transpeptidation reaction C) Translocation D) All of the above
During the process of translation, the growing polypeptide chain is released from the ribosome when:Select one:a. The 7-methylguanosine cap is reachedb. A chain terminating tRNA binds to the ribosomec. The poly A tail is reachedd. A chain terminating codon is reached
Which of the following statements best describes a translocation?Shifting of a part of a chromosome to another non-homologous chromosomeShifting of a chromosome to another chromosomeShifting of a part of a chromosome to another homologous chromosomeShifting of part of chromosomes to the outside membrane of the nucleus
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