20. If large amounts of hot water are released from a power plant or factory into a lake: the surrounding ecosystem will be unaffected as long as the water is clean.
O the amount of dissolved oxygen in that part of the lake will decrease.
о
the warm water will decrease the metabolic rate of local fish, so their need for
dissolved oxygen will decrease.
the amount of dissolved oxygen in that part of the lake will increase.

Before the can be observed by using a transmission electron microscope, cells are sliced into very thin sections. what disadvantage does this procedure present in the study of cellular parts

According to the cladogram, which organisms have roundworms as a common ancestor?

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?