Aresearcher engineers a lac operon on a plasmid, but inactivates all parts of the lac operator (laco) and the lac promoter, replacing them with the binding site for the lexa repressor (which acts in the sos response) and a promoter regulated by lexa. the plasmid is introduced into e. coli cells that have a lac operon with an inactive lacz gene. under what conditions will these transformed cells produce β-galactosidase?

Which sociologist posits that, as a society modernizes, it must rely less on tradition, and more on rational, and impersonal procedures?

How did the end of the mexican american war result in growing sectionalism in the united states?

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups.b. a researcher conducts a linguistic study of comments posted on a local public blog.c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression.d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.