When you want to move a part of your body, your brain sends a signal to the muscles

The muscles Contract and relax randomly

Contract and pull on bones directly

Contract and pull on tendons, which pull on the bones

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?

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

What is the goal of cellular respiration