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Molecular Biology Practice Test: Regulation of Transcription in Prokaryotes
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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
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25 Questions

1. Which of the following is not the handiwork of siRNA?
2. The regulatory molecules bind to the catalytic site of an enzyme to regulate its activity.
3. Acetylation of histone increases transcription of gene due to ___________
4. Immunoglobulin enhancers are active in which of the following cell types?
5. Pick the odd one out.
6. Female mammals are called genetic mosaics.
7. What effect would a loss-of-function mutation have on the expression of the gene encoding the catabolite activator protein of the lac operon?
8. In the case of lac operon, the gene expression is inhibited by __________
9. The region of maximum methylation in the genome is predominantly activated.
10. The investigation of the lac operon for the metabolism of lactose was done by __________
11. Enhancers were first identified in __________
12. Among the following which shows the maximum rate of cytosine methylation?
13. The maternal X-chromosome is inactivated during Dosage compensation.
14. The proposal for the concept of X-chromosome inactivation in female XX-chromosomes was experimentally shown in ___________
15. Which of the following about the enhancer sequence is incorrect?
16. The best genetic mosaicism is observed in which of the following?
17. The Intergenic CpGs are more commonly methylated than in the intragenetic region.
18. If the siRNA is a complete homolog of the target mRNA sequences what is the net result?
19. Which of the following is not present in the β-galactosidase structural gene and thus is not transcribed by the same promoter?
20. Which of the following is incorrect about the inactive state of the Ras protein?
21. Defects in which regions can affect the activity of the lac operon?
22. Like kinases all phosphatases are also species specific in nature.
23. Regulation of enzyme activity is accomplished in ___________ steps.
24. Stem loop precursors are generally seen in which of the following?
25. The complete expression of the lac operon requires __________