Genetic Regulation Prokaryotes problems
- 1. Catabolite activating protein exerts __________ control on transcription of the lac operon genes.
Options- A. positive
- B. negative
- C. may be positive or negative
- D. none of these Discuss
Correct Answer: positive
- 2. Genes which need to be coordinately regulated but are not in operons may be regulated by
Options- A. common transcription factor binding domains
- B. TATA boxes
- C. CAAT regions
- D. GC regions Discuss
Correct Answer: common transcription factor binding domains
- 3. The lac operon is transcribed in which segments?
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
Correct Answer: 1
- 4. Which of the following occur in the presence of glucose?
Options- A. lac Z gene expression is increased
- B. cAMP increases
- C. Binding of CAP-cAMP complex to the promoter area decreases
- D. none of the above Discuss
Correct Answer: Binding of CAP-cAMP complex to the promoter area decreases
- 5. DNA is methylated at
Options- A. AC sequences
- B. TATA sequences
- C. CAAT sequences
- D. CG sequences Discuss
Correct Answer: CG sequences
- 6. A frameshift mutation occurs in the sigma subunit gene transcribed as part of SPOl early genes. What will be the immediate result?
Options- A. Early genes will not be translated
- B. Middle genes will not be transcribed
- C. The bacterial host will lyse immediately
- D. Infection will proceed as usual Discuss
Correct Answer: The bacterial host will lyse immediately
- 7. In the presence of high levels of tryptophan
Options- A. attenuator allows transcription of trp structural genes
- B. attenuator propogates transcription
- C. attenuator terminates transcription
- D. none of the above Discuss
Correct Answer: attenuator terminates transcription
- 8. Which of the following is not a transcription factor?
Options- A. Helix-turn-helix proteins
- B. Zinc finger proteins
- C. Leucine zipper proteins
- D. Steroid hormones Discuss
Correct Answer: Steroid hormones
- 9. Tubulin is regulated by
Options- A. binding of tubulin to tubulin mRNA
- B. splicing of the tubulin transcript
- C. binding of tubulin to the tubulin translational product
- D. binding of tubulin to DNA Discuss
Correct Answer: binding of tubulin to the tubulin translational product
- 10. Enhancers differ from promoters in that
Options- A. they initiate transcription
- B. they are adjacent to the start codon
- C. their orientation can be inverted without effect
- D. they are restricted to a specific gene Discuss
Correct Answer: their orientation can be inverted without effect
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