The anterior interventricular artery supplies a portion of the heart wall with oxygenated blood. Suppose that blood is flowing through a healthy region of this artery but then flows through a region that is atherosclerotic. What will happen to blood flow when it reaches the atherosclerotic region? The anterior interventricular artery supplies a portion of the heart wall with oxygenated blood. Suppose that blood is flowing through a healthy region of this artery but then flows through a region that is atherosclerotic. What will happen to blood flow when it reaches the atherosclerotic region? The amount of oxygen in the blood will increase. Blood velocity will increase. The amount of oxygen in the blood will decrease. Blood velocity will decrease.

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?