MMSC490 Quiz 8 (All questions are correctly solved)

According to the central dogma of molecular biology, transcription of genetic information occurs via... A) DNA-dependent RNA synthesis. B) RNA-dependent protein synthesis. C) RNA-dependent DNA synthesis. D) DNA-dependent DNA synthesis. correct answers A) DNA-dependent RNA synthesis In prokaryotes, σ factors are necessary for... A) low-affinity binding upstream for promoters. B) specific binding to certain promoters. C) All of the above. D) elongation of the RNA strand to its end. correct answers B) specific binding to certain promoters. Which of the following statements about transcriptional termination in prokaryotes is false? A) The Rho protein binds long stretches of single nucleotides, blocking continued transcription. B) The ribosome comes to a UAA, UAG, or UGA stop codon and transcription cases. C) Termination is signaled by a GC-rich interval that forms a stem-loop structure in the RNA. D) Transcription terminates when the RNA polymerase dissociates from its DNA template. correct answers B) The ribosome comes to a UAA, UAG, or UGA stop codon and transcription cases. The lac operon in E. coli is regulated by lactose, which... A) activates an activator of transcription. B) activates a repressor of transcription. C) inactivates a repressor of transcription. D) inactivates an activator of transcription. correct answers C) inactivates a repressor of transcription.