8. the phosphorus cycle involves mainly the
a. atmosphere and biosphere.
b. lithosphere and hydrosphere.
c. geosphere and biosphere.
d. asthenosphere and hydrosphere.

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?

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 statement is a physical property? becomes moldy quicklyeasy to digestconducts electricity poorlydoes not burn