Discussion
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- Question
What is the action of tetracycline in prokaryotes?
Options- A. It blocks translocation reaction on ribosomes
- B. It blocks peptidyl transferase reaction on ribosomes
- C. It blocks the binding of amino-acyl tRNA to the A site of ribosomes
- D. Not known with certainity
- Correct Answer
- It blocks the binding of amino-acyl tRNA to the A site of ribosomes
- 1. Three stop codons, which aids in termination of translation are also known as
Options- A. pause codons
- B. nonsense codons
- C. missense codons
- D. antisense codons Discuss
- 2. Which of the following act as the blueprint or template for the process of protein synthesis that takes place on ribosomes?
Options- A. rRNA
- B. DNA
- C. tRNA
- D. mRNA Discuss
- 3. The ribosome binding site
Options- A. forms a stem-loop structure in the RNA
- B. is located upstream of the promoter sequence
- C. is located immediately upstream of the start codon
- D. is more likely to be associated with an operon than with a gene encoding a single protein Discuss
- 4. When was the genetic code completed?
Options- A. 1958
- B. 1952
- C. 1966
- D. 1968 Discuss
- 5. What is the direct cause of cell death by diphtheria toxin?
Options- A. Formation of an ion channel in the cell membrane
- B. Inactivation of a translational elongation factor
- C. Induction of apoptosis
- D. None of the above Discuss
- 6. What is the maximum number of different amino acids in a polypeptide chain coded by the synthetic polyribonucleotides (UCAG)5?
Options- A. One
- B. Two
- C. Three
- D. Four Discuss
- 7. Which binding is inhibited by pactamycin?
Options- A. Aminoacyl-tRNA to the A-site of 30S subunit
- B. Initiator-tRNA to 30S/40S initiation complexes
- C. Peptidyl t-RNA to the 50S subunit
- D. Formation of peptide bond in P site Discuss
- 8. Which stop codon has been found to encode selenocysteine?
Options- A. UAA
- B. UAG
- C. UGA
- D. AGA Discuss
- 9. Which of the following defines an open reading frame (ORF)?
Options- A. A sequence of genome in bacteriophage
- B. The sequence of a complete genome
- C. A plasmid vector used in genome sequencing
- D. A possible gene predicted by DNA sequencing Discuss
- 10. The final step of gene expression is protein synthesis, which is also known as
Options- A. replication
- B. translation
- C. transcription
- D. none of these Discuss
Translation and Regulation problems
Search Results
Correct Answer: nonsense codons
Correct Answer: mRNA
Correct Answer: is located immediately upstream of the start codon
Correct Answer: 1966
Correct Answer: Inactivation of a translational elongation factor
Correct Answer: Three
Correct Answer: Initiator-tRNA to 30S/40S initiation complexes
Correct Answer: UGA
Correct Answer: A possible gene predicted by DNA sequencing
Correct Answer: translation
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