Visualize that a patch clamp experiment revealed what could be a new potassium ion channel in mouse neurons. Recordings from the mouse neuron showed a potassium outward current in response to a depolarization by 10 mV from -68 to -58 mV. (The resting membrane potential was -68mV). When the calcium ion concentration was raised from 2 to 8 mM in the extracellular medium, the potassium outward current increased by about 50% from 4 µA to 6 µA. The sodium inward current remained unchanged. The calcium mediated effect on the potassium current is immediate. What type of potassium channel could be involved and how could this channel affect the generation of action potentials? Explain

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?