Which of the following is most likely to be an observation made by an anatomist?

a.) rna polymerase binds to a promoter, a dna sequence that becomes a gene.
b.) sensory receptors convert information into impulses to be sent to the cns
c.) the heart's epicardium forms a protective outer covering and secretes serous fluid.
d.) the middle ear is an air-filled space that separates the outer and inner ear.

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?

Where is pericardial fulid located

Spirochetes have a twisting and flexing locomotion due to appendages called