5. Which of the following descriptions of EF-Tu is correct?A. EF-Tu delivers fMet-tRNA to the A site of the ribosome.B. EF-Tu delivers fMet-tRNA to the P site of the ribosome.C. EF-Tu facilitates the translocation of tRNA and mRNA down the ribosome in elongation.D. EF-Tu hydrolyses GTP to GDP.E. EF-Tu participates in translation termination.

Introduction: Elongation factors deliver aminoacyl-tRNA to the ribosome. Ef-Tu is a monomeric…

Answered: . Which of the following descriptions…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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In considering the 7 levels of gene regulation, which of the following mechanisms acts at first level? a. repressor binding to sequence blocking the promoter b. miRNA silencing c. differential processing of RNA d. protein modification e. answer may vary depending if this occurs in a prokaryote or a eukaryote
Which of the following statements about trp operon regulation is TRUE? A. Low trp levels result in trp repressor binding. O B. High trp levels result in transcriptional antitermination. C. Low trp levels cause the ribosome to fall off at the trp codons in the upstream ORF. O D. High trp levels cause the ribosome to fall off at the trp codons in the upstream ORF. O E. Low trp levels result in transcriptional antitermination. QUESTION 34 Consider the following partial diploid for the lac operon system. lacl+ O+ lac Z+Y-A- lacls O+ 1. 2. lac Z-Y+ A+ In this configuration, which of the following statements is TRUE? A. With no lac present, ZYA will all be expressed. B. with lac present none of the genes (ZYA) will be expressed. O C. With no lac present, only YA will be expressed. D. None of these answers is correct. E. With no lac present, only Z will be expressed.
Which of the following are elongation factors involved in the release of free tRNAs? a.EF-G b.EF-Ts c.EF-Tu d.EF-P
Which of the following statements is true regarding transcriptional attenuation of the trp operon? a. The leader peptide encodes a protein that binds to the operator site b. Translation of the leader peptide stalls when tryptophan levels are high c. Stalling of the ribosome in region 1 of the leader peptide inhibits formation of the transcriptional terminator sequence d. This kind of mechanism can only occur in prokaryotes e. Both c. and d. are true
You are studying how gene expression is regulated in the cell. For gene z, you find that while there are high levels of mRNA in the cell, there are low levels of the protein encoded by gene z. Describe a regulatory mechanism that could explain this finding that occurs after translation.
Transcription in prokaryotic cells O A. is initiated at a promoter and uses only one strand of DNA (the template strand) to synthesize a complementary RNA strand. B. occurs in the nucleus, whereas translation occurs in the cytoplasm. C. is terminated at a stop codon. D. does not need a promoter. O E. is initiated at a start codon with the help of initiation factors and the small subunit of the ribosome. 5
Some research suggests that translation of proteins is regulated by ribosome stalling: ribosomes attach to mRNA and then stall; elongation commences only in response to a specific stimulus. What might be an advantage to gene regulation by ribosome stalling?
All of the following regarding ribosomes are true EXCEPT: A. Ribosomes are comprised of protein and RNA. B. Ribosomes coordinate with initiation and elongation factors to regulate translation. C. Ribosomes bind transcripts in their promoters. D. Prokaryotic ribosomes are comprised of a large and a small subunit. E. Ribosomes in eukaryotic cells bind to complete transcripts.
Define the following terms:a. decoding centerb. peptidyl transferase centerc. GTPase-associated centerd. guanine nucleotide exchange factore. proton shuttle mechanism
For each statement about gene expression mechanisms, choose the correct end to the sentence. For each gene, the template strand for transcription is determined by…. The direction of translation is determined by…… The tissue-specificity of protein production is determined by…. choices: a. location of the start codon b. location of the promoter c. direction of polymerization by RNA polymerase d. none of these e. direction of movement of ribosomes f. overall orientation of the chromosome

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