2.) The catabolite activator protein in the lac operon is part of a mechanism that: reduces available lactose in the cell senses cellular starvation signals and triggers gene expression binds to the operator and outcompetes lac repressor deactivates RNA polymerase and thus reduces expression senses low levels of tryptophan and activates gene expression _____ 3.) Differential gene expression refers to: how prokaryotes activate the trp and lac operon when needed how prokaryotes can selectively express a single gene in an operon how eukaryotes constantly express all genes but only translate the genes they need how eukaryotes can express different genes by cells with the same genome how both prokaryotes and eukaryotes must both unwind their DNA prior to gene expression _____ 4.) Which modifications, correctly paired, serve to reduce gene expression? histone deacetylation and DNA methylation histone acetylation and DNA methylation histone deacetylation and DNA demethylation neither histone acetylation or DNA methylation affect expression more than one answer is correct _____ 5.) The functioning of enhancers is an example of: transcriptional control of gene expression a post-transcriptional mechanism to regulate mRNA the removal on introns and alternative splicing of exons post-translational controls that activates certain proteins a eukaryotic equivalent of prokaryotic promoter functioning

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