Which process requires energy from food to help a cell maintain homeostasis? A. a phosphate ion being released from ATP
B. a phosphate ion being added to ADP
C. the conversion of glucose to oxygen
D. the creation of RNA from DNA

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 required of a new drug?me

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin