Discussion
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- Question
Which of these catalyzes the synthesis of RNA from a DNA template?
Options- A. DNA gyrase
- B. DNA ligase
- C. DNA polymerase
- D. RNA polymerase
- Correct Answer
- RNA polymerase
- 1. A specific __________ factor helps RNA polymerase bind to late promoters and transcribe late genes.
Options- A. sigma
- B. beta
- C. delta
- D. gamma Discuss
- 2. The sigma factor
Options- A. is responsible for recognizing the termination sequence
- B. provides the catalytic function of cleaving off pyrophosphates during mRNA synthesis
- C. recognizes the promotor
- D. accomplishes DNA restriction Discuss
- 3. The synthesis of mRNA based on a DNA template is called
Options- A. DNA replication
- B. transcription
- C. translation
- D. DNA restriction Discuss
- 4. What is the usual sequence of a Pribnow box?
Options- A. AUAUA
- B. TATAAT
- C. UUUUU
- D. TTGACA Discuss
- 5. Which of the following statement defines a replicon?
Options- A. A DNA molecule that encodes pili for conjugation
- B. A DNA molecule that is able to replicate and be maintained
- C. A DNA template which is used in transcription
- D. The enzyme responsible for transposition Discuss
- 6. The location of first hexameric sequence typically found in pro-karyotic promoters is
Options- A. at the transcription start site
- B. approximately 35 bases upstream of the transcription start site
- C. approximately 10 bases upstream of the transcription start site
- D. approximately 25 bases upstream of the transcription start site Discuss
- 7. Thymine dimers are directly repaired with the help of visible light by process known as
Options- A. phosphorylation
- B. excision repair
- C. photosynthesis
- D. photoreactivation Discuss
- 8. A nonsense mutation may result into
Options- A. an abnormal elongation of a polypeptide
- B. a large deletion within the reading frame of a gene
- C. a premature termination of the synthesis of a polypeptide
- D. modification of mRNA Discuss
- 9. The promoter on an expression vector used to overproduce proteins in bacteria is
Options- A. a bacterial promoter
- B. expressed both in bacteria and mammalian cells
- C. not a regulated promoter
- D. the natural promoter of the gene being cloned Discuss
- 10. Frame shift mutation may occur as a result of
Options- A. formation of a thymine-dimer
- B. deamination of cytosine to uracil
- C. conversion of guanine to xanthine
- D. none of the above Discuss
Transcription problems
Search Results
Correct Answer: sigma
Correct Answer: recognizes the promotor
Correct Answer: transcription
Correct Answer: TATAAT
Correct Answer: A DNA molecule that is able to replicate and be maintained
Correct Answer: approximately 35 bases upstream of the transcription start site
Correct Answer: photoreactivation
Correct Answer: a premature termination of the synthesis of a polypeptide
Correct Answer: a bacterial promoter
Correct Answer: none of the above
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