Bio 2000 Exam 3 Study Guide- Questions with Correct Answers

the lac operon is expressed when glucose is low and lactose is high when in a complex with ____, the CAP protein binds to the CAP site and _____ the expression of lac operon. cAMP; switches on in the absence of lactose, the lac repressor is active and can bind to the operator which region associated with the lac operon is not involved in the binding of RNA polymerase? lacZ RNA polymerase binds to the promoter the most efficient control of eukaryotic gene expression is achieved at the level of transcription initiation at which of the following levels can gene expression be regulated in eukaryotes? passage of mRNA through the nuclear membrane, destruction of the mRNA, and rate of protein synthesis what level of regulation do eukaryotes possess that prokaryotes do not? transport of RNA out of the nucleus DNA is associated with proteins to form _____ chromatin a ______ is composed of DNA wrapped around an octamer of histone proteins nucleosome An activator can increase transcription by attracting a _____ to the region. histone acetyltransferase addition of (-COCH3) groups to histone amino terminal tails results in a/an _____ in gene expression increase removal of acetyl groups from histones results in a ____ in gene expression decrease methylation of which genes is most likely to lead to cancerous cell formation? genes that prevent cell division