White bunnies are a common sight on farms and in pet stores. why are these domestic white rabbits uncommon in the wild? a) domestic white rabbits and wild brown rabbits are different rabbit species. b) genetically, it is impossible for two brown rabbits to produce white offspring. c) domestic white rabbits are the result of selective breeding and are rarely found in the wild. d) white rabbits are as common in the wild as on farms, but they hide better than brown rabbits to avoid predators.

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?