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Question 13 (1 point) Alternative sigma factors initiate transcription in different genes by recognizing characteristic sequences...
Question 11 Question 11 ???????? In the absence of arabinose, the regulatory protein AraC a forms a dimer, binds to two regulatory sequences near the promoter, and activates transcription of the arabinose operon structural genes. b forms a dimer, binds to two distant sites, and forms a DNA loop that blocks access of RNA polymerase to the arabinose operon promoter. c binds to the arabinose operator and represses transcription of the arabinose operon structural genes. d binds to the arabinose...
1) The lac operon is… a) Positive repressible b) Both negative inducible and positive repressible c) Positive inducible d) Negative inducible 2) An activator regulatory protein… a) Is involved in negative regulatory control b) Is a cis acting regulatory element c) Recruits RNA polymerase to the promoter d) Prevents RNA polymerase from binding the promoter 3) For the lac operon, the presence of the substrate (lactose) activates the repressor. True or False? a) true b) false 4) cAMP… a) Activates...
one correct answer Question 12 (1 point) What are the trans acting factors that control transcription in bacterial genes? O cap, start codon, stop codon. enhancers, silencers, operator, promoter, polyadenylation signal. 5 prime end of RNA, GU-splice site, branch point-A, AG-splice site, polyadenylation signal. O repressors, activators, cap, start codon, stop codon. O promoters, GU-splice site, branch point-A, AG-splice site, polyadenylation signal. enhancers, silencers, promoters, polyadenylation signal. repressors, activators. attenuators, Shine-Dalgarno sequence, start codon, stop codon attenuators, activator binding site,...
Question 1 Match the term with the best definition or description; most topics relate to the regulation of gene expression. General type of protein which will increase transcription rates when it attaches to a site A. Factor connected to a particular gene - B. Co-repressor C. Enhancer D. Promoter E. Structural F. Intron G. Activator H. Operator I. Basal transcription J. Glucocorticoid receptor K. Sigma factor L. Mediator M. Inducer N. TATA box O. Repressor The rates of mRNA produced...
1. trans-acting factors are able to regulate target genes from any chromosome, whereas cis-acting elements can only regulate genes located in the same chromosome. a. True only in operons. In Eukaryotic systems, trans-acting factors only regulate genes in the same chromosome. b. True only in Eukaryotes. Prokaryotes don’t have cis-acting elements. c. True for any organism. d. False. The statement is erroneous 2. Unlike activators, repressors never affect chromatin structure. Repressors inhibit transcription only by binding to the binding sites...
all them please Question 23 (1 point) The A and B alleles in ABO blood types can give rise to an individual that is blog type AB. This specific blood type is an example of: A) multiple alleles B) epistasis C) codominance D) partial dominance Imagine the gene encoding the lac repressor was mutated so that lactose (more technically allolactose) no longer bound to the repressor. However, the lac repressor was still capable of binding DNA at the operator sequence....