Home > CompTIA A+ Exam > Quizzes > Molecular Biology Practice Test: Regulation of Transcription in Prokaryotes
Molecular Biology Practice Test: Regulation of Transcription in Prokaryotes
Fast practice, instant feedback. Timer auto-submits when time’s up.
Avg score: 61% Most missed: “Which of the following about the enhancers is false?”
Regulation of Transcription in Prokaryotes topics include: gene regulation, regulation levels, activators and repressors in positive and negative regulation, transcriptional regulation in eukaryotes, methylation of eukaryotic dna controls gene expression, x-chromosomes inactivation and rnas in gene regulation. Transcription in prokaryotes is regulated by operons, which are regions of DNA that contain one or more genes that code for proteins. Operons also include a promoter and an operator, which is a region where regulatory proteins bind.  Transcription factors in prokaryotes sense changes... Show more
Molecular Biology Practice Test: Regulation of Transcription in Prokaryotes
Time left 00:00
25 Questions

1. Inactive miRNA undergoes how many cleavages before incorporation into the RISC complex?
2. What effect would a loss-of-function mutation have on the expression of the gene encoding the catabolite activator protein of the lac operon?
3. The phenomenon of allelic exclusion leads to the inactivation of one allele of a gene. The active allele is known as ____________
4. The CpG islands generally consist of how many GC bases?
5. Which of the following about the enhancer sequence is incorrect?
6. The one which is able to repress the production of the Xist transcript is the active X chromosome.
7. X-chromosome inactivation is known as ______________
8. In case of transcription which is the rate limiting step?
9. In which stage of the cell cycle the Barr body can be identified?
10. Which of the following about the differences between the prokaryotic and eukaryotic genes are true?
11. Mutation in the regulatory gene of a positively controlled operon can be identified by __________
12. Like kinases all phosphatases are also species specific in nature.
13. De-novo methylation is done in the newly synthesized DNA strand at opposite positions of the methylated sites on the parent strand.
14. If the lac operon of the genome of bacteria is always active it has a defect in which region of the operon?
15. In humans CpG islands are generally located in the ____________
16. How many types of methylation processes are known in eukaryotic cells?
17. Which of the following is true about tryptophan operon?
18. siRNA are produced by __________
19. Choose the correct pair among the following.
20. Enhancers are a unit of multiple functional sequence elements that together regulates the expression of a gene.
21. With respect to the methylation of bases which of the following is correct?
22. Immunoglobulin enhancers are active in which of the following cell types?
23. Which of the following about the enhancers is false?
24. Introduction of ds DNA can repress gene expression.
25. The first miRNA was identified in C. elegans named __________