Reactions in cells are generally regulated by regulating the activity of the enzyme that catalyzes that reaction. Broadly speaking, enzyme can be regulated by (a) changing the amount of enzyme present in the cells, or (b) changing the activity of the existing enzymes. Mark all the ways in which the amount of enzyme can be regulated in cells. A. Regulating degradation.
B. Regulating Translation.
C. Regulating Transcription.
D. Binding allosteric regulators.

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?