Which of the following describes an interaction between the musculoskeletal system and the respiratory system? the air sacs absorb more oxygen during vigorous exercise. the air sacs are used due to signals from the brain. the blood delivers glucose and oxygen to cells. the blood carries waste materials to the kidneys. answer quick

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

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?

Food contains a sugar called ( ), which is broken down in a process called cellular ( ). this process uses ( ) to break down food molecules and provide energy for cells. fill in the parentheses