The kidney is referred to as an excretory organ because it excretes __1__ wastes. it is also a major homeostatic organ because it maintains the electrolyte, __2__ and __3__ balance of the blood.

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?

You see a white marker with an orange circle and black lettering. what does this marker tell you

How does food concentration affect yeast activity