Examen
Microbiology Translation and Regulation Q and A Compilation
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Question and Answer Compilation
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Translation and Regulation A. Ending frameB. Leader sequence
1. Which binding is inhibited by pactamycin? C. Trailer sequence
D. Reading frame
A. Aminoacyl-tRNA to the A-site of 30S subunit
B. Initiator-tRNA to 30S/40S initiation complexes 8. Which phage always carries a small piece of E.coli
C. Peptidyl t-RNA to the 50S subunit genome?
D. Formation of peptide bond in P site
A. Lambda
2. Which of the following act as the blueprint or template B. Mu
for the process of protein synthesis that takes place on C. T4
ribosomes? D. T3
A. rRNA 9. The final step of gene expression is protein synthesis,
B. DNA which is also known as
C. tRNA
D. mRNA A. replication
B. translation
3. Negative regulation of protein synthesis is accomplished C. transcription
by D. none of these
A. allosteric inhibition 10. What is the maximum number of different amino acids
B. the binding of RNA polymerase to the promoter in a polypeptide chain coded by the synthetic
C. the binding of a repressor to the DNA polyribonucleotides (UCAG)5?
D. the binding of a repressor to the RNA polymerase
A. One
4. Site in the ribosome from which the tRNA donates B. Two
amino acids to the growing polypeptide chain is C. Three
D. Four
A. P site
B. O site
C. T site 11. What is the direct cause of cell death by diphtheria
D. A site toxin?
5. When was the genetic code completed? A. Formation of an ion channel in the cell membrane
B. Inactivation of a translational elongation factor
A. 1958 C. Induction of apoptosis
B. 1952 D. None of the above
C. 1966
D. 1968 12. The development of global regulatory systems in
prokaryotes
6. Which stop codon has been found to encode
selenocysteine? A. determines the exact location of the cell on the globe
B. aids in DNA replication
A. UAA C. determines the exact location of the replication site
B. UAG D. regulates many genes under varying environmental
C. UGA conditions
D. AGA
13. The interaction between the mRNA and tRNA
7. Which of the following is a nontranslated sequence determined the position of amino acid in a polypeptide
located between the transcription and the translation start sequence. This is called the
site?
A. stagerivity
B. Wobble hypothesis
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