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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. Introduction of ds DNA can repress gene expression.
2. How many mechanisms are present to enhance transcription by the enhancer molecules?
3. Like kinases all phosphatases are also species specific in nature.
4. Mutation in the regulatory gene of a positively controlled operon can be identified by __________
5. How many enzymes are produced in the lac operon under the same promoter?
6. Enhancers were first identified in __________
7. Operons are ___________
8. Which of the following is incorrect about the inactive state of the Ras protein?
9. Enhancers in which of the following positions are unable to enhance the process of transcription?
10. The RNAi mediated gene silencing includes the binding of siRNA to form a complex with the target gene called RISC.
11. Which of the following is true about tryptophan operon?
12. The functional unit in which genes are arranged consecutively is known as ___________
13. Binding of small molecules to enzymes leads to feedback inhibition.
14. The Intergenic CpGs are more commonly methylated than in the intragenetic region.
15. piRNAs are synthesized in a Dicer dependent mechanism.
16. Protein kinases transfer phosphate groups to the side chains of which of the following?
17. De-novo methylation leads to the phenomenon of genetic imprinting in the offspring.
18. Which of the following about the differences between the prokaryotic and eukaryotic genes are true?
19. The miRNAs are transcribed from non-protein encoding genes and are typically __________ nucleotides long.
20. The CpG islands generally consist of how many GC bases?
21. The lac operon is regulated by cAMP by ___________
22. The investigation of the lac operon for the metabolism of lactose was done by __________
23. Which of the following RNAs can induce gene silencing?
24. The phenomenon of allelic exclusion leads to the inactivation of one allele of a gene. The active allele is known as ____________
25. Stem loop precursors are generally seen in which of the following?