biochem help! 1. Which is incorrect about the initiation of translation? A. A ri
ID: 71673 • Letter: B
Question
biochem help!1. Which is incorrect about the initiation of translation? A. A ribosome binds to mRNA using an anti-Shine-Delgarno sequence of 16S rRNA. B. In bacteria, most of the starting Met codon is decoded by fMet-tRNAfMet. C. Only after fMet-tRNAfMet is bound, the 50S subunit binds. D. Premature assembly of ribosomes is prevented by IF-1 and IF-3. E. None of the above.
2. Which is correct about the peptide transfer during translation? A. Peptide is always transferred to the A site tRNA from the P site tRNA. B. Translation is not affected by availability of GTP. C. Peptide bond formation is catalyzed by a ribosomal protein. D. All of the above. E. None of the above.
3. Unlike RNA polymerase, DNA polymerase always needs a preexisting 3’-OH for elongation. To fulfill this requirement, ____. Which is not right? A. a primase is needed for the synthesis of primers for DNA replication. B. a short DNA primer is needed for PCR reactions. C. a host tRNA is used for the synthesis of DNA from HIV RNA templates. D. an RNA cannot serve as a primer.
4. Mechanism for regulation of the trp operon is described. Which is incorrect? A. Transcription is down-regulated by the trp repressor, which is activated upon binding of Trp. B. Ribosome stalled due to a low concentration of Trp induces an alternative mRNA structure, resulting in continued transcription. C. Activity of the Trp synthesis operon is doubly controlled by the Trp concentrations. D. All of these. E. None of these.
5. Which is regulatory mechanism related to regulation of gene activity? A. Transcription repressor/activator proteins, which bind close to the promoter regions. B. SAM binding to a riboswitch mRNA. C. Alterations in mRNA conformations by Trp availability. D. All of these. E. None of these.
biochem help!
1. Which is incorrect about the initiation of translation? A. A ribosome binds to mRNA using an anti-Shine-Delgarno sequence of 16S rRNA. B. In bacteria, most of the starting Met codon is decoded by fMet-tRNAfMet. C. Only after fMet-tRNAfMet is bound, the 50S subunit binds. D. Premature assembly of ribosomes is prevented by IF-1 and IF-3. E. None of the above.
2. Which is correct about the peptide transfer during translation? A. Peptide is always transferred to the A site tRNA from the P site tRNA. B. Translation is not affected by availability of GTP. C. Peptide bond formation is catalyzed by a ribosomal protein. D. All of the above. E. None of the above.
3. Unlike RNA polymerase, DNA polymerase always needs a preexisting 3’-OH for elongation. To fulfill this requirement, ____. Which is not right? A. a primase is needed for the synthesis of primers for DNA replication. B. a short DNA primer is needed for PCR reactions. C. a host tRNA is used for the synthesis of DNA from HIV RNA templates. D. an RNA cannot serve as a primer.
4. Mechanism for regulation of the trp operon is described. Which is incorrect? A. Transcription is down-regulated by the trp repressor, which is activated upon binding of Trp. B. Ribosome stalled due to a low concentration of Trp induces an alternative mRNA structure, resulting in continued transcription. C. Activity of the Trp synthesis operon is doubly controlled by the Trp concentrations. D. All of these. E. None of these.
5. Which is regulatory mechanism related to regulation of gene activity? A. Transcription repressor/activator proteins, which bind close to the promoter regions. B. SAM binding to a riboswitch mRNA. C. Alterations in mRNA conformations by Trp availability. D. All of these. E. None of these.
biochem help!
1. Which is incorrect about the initiation of translation? A. A ribosome binds to mRNA using an anti-Shine-Delgarno sequence of 16S rRNA. B. In bacteria, most of the starting Met codon is decoded by fMet-tRNAfMet. C. Only after fMet-tRNAfMet is bound, the 50S subunit binds. D. Premature assembly of ribosomes is prevented by IF-1 and IF-3. E. None of the above.
2. Which is correct about the peptide transfer during translation? A. Peptide is always transferred to the A site tRNA from the P site tRNA. B. Translation is not affected by availability of GTP. C. Peptide bond formation is catalyzed by a ribosomal protein. D. All of the above. E. None of the above.
3. Unlike RNA polymerase, DNA polymerase always needs a preexisting 3’-OH for elongation. To fulfill this requirement, ____. Which is not right? A. a primase is needed for the synthesis of primers for DNA replication. B. a short DNA primer is needed for PCR reactions. C. a host tRNA is used for the synthesis of DNA from HIV RNA templates. D. an RNA cannot serve as a primer.
4. Mechanism for regulation of the trp operon is described. Which is incorrect? A. Transcription is down-regulated by the trp repressor, which is activated upon binding of Trp. B. Ribosome stalled due to a low concentration of Trp induces an alternative mRNA structure, resulting in continued transcription. C. Activity of the Trp synthesis operon is doubly controlled by the Trp concentrations. D. All of these. E. None of these.
5. Which is regulatory mechanism related to regulation of gene activity? A. Transcription repressor/activator proteins, which bind close to the promoter regions. B. SAM binding to a riboswitch mRNA. C. Alterations in mRNA conformations by Trp availability. D. All of these. E. None of these. 1. Which is incorrect about the initiation of translation? A. A ribosome binds to mRNA using an anti-Shine-Delgarno sequence of 16S rRNA. B. In bacteria, most of the starting Met codon is decoded by fMet-tRNAfMet. C. Only after fMet-tRNAfMet is bound, the 50S subunit binds. D. Premature assembly of ribosomes is prevented by IF-1 and IF-3. E. None of the above.
2. Which is correct about the peptide transfer during translation? A. Peptide is always transferred to the A site tRNA from the P site tRNA. B. Translation is not affected by availability of GTP. C. Peptide bond formation is catalyzed by a ribosomal protein. D. All of the above. E. None of the above.
3. Unlike RNA polymerase, DNA polymerase always needs a preexisting 3’-OH for elongation. To fulfill this requirement, ____. Which is not right? A. a primase is needed for the synthesis of primers for DNA replication. B. a short DNA primer is needed for PCR reactions. C. a host tRNA is used for the synthesis of DNA from HIV RNA templates. D. an RNA cannot serve as a primer.
4. Mechanism for regulation of the trp operon is described. Which is incorrect? A. Transcription is down-regulated by the trp repressor, which is activated upon binding of Trp. B. Ribosome stalled due to a low concentration of Trp induces an alternative mRNA structure, resulting in continued transcription. C. Activity of the Trp synthesis operon is doubly controlled by the Trp concentrations. D. All of these. E. None of these.
5. Which is regulatory mechanism related to regulation of gene activity? A. Transcription repressor/activator proteins, which bind close to the promoter regions. B. SAM binding to a riboswitch mRNA. C. Alterations in mRNA conformations by Trp availability. D. All of these. E. None of these.
Explanation / Answer
1). E. None of the above.
A. A ribosome binds to mRNA using an anti-Shine-Delgarno sequence of 16S rRNA. --------> TRUE
B. In bacteria, most of the starting Met codon is decoded by fMet-tRNAfMet. -----------> TRUE
C. Only after fMet-tRNAfMet is bound, the 50S subunit binds. -------------------> TRUE
D. Premature assembly of ribosomes is prevented by IF-1 and IF-3. -------------> TRUE
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