The diagram illustrates part of the carbon cycle.
which best describes the diagram?
a consumer is obtaining carbon by breathing it in from the
atmosphere.
a consumer is obtaining carbon by absorbing it from the
soil.
• a consumer is obtaining carbon by eating carbon-based
molecules stored in a producer.
a consumer is obtaining carbon by eating carbon-based
molecules stored in a decomposer.

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?