Match the terms to their definition. 1. evolution genetic change in a population or species over many generations 2. lineage group of related organisms that share features and characteristics 3. macroevolution evolution at or below the species level 4. microevolution the expression of a genetic trait, or what the trait looks like 5. phenotype evolution above the species level 6. species continuous line of descent

In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?

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?

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?