Which statement is true for single-celled organisms? a. they are often harmless. b. they always cause disease. c. they only live inside humans. d. they reproduce in a complicated process.

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?

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the: