Doctors do not administer vaccinations to people who are too sick. which best explains why? the weakened or dead form of the pathogen may be attacked by ther person's immune system. the weakened or dead form of the pathogen may have a fatal effect when it is combined with medication that the sick people are taking. the digestive systems of sick people may be negatively affected by the weakened or dead pathogen. the white blood cells of sick people may not be able to efficiently handle the weakened or dead form of the pathogen.

You arrive late to a biological seminar. however, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. immediately, you know that they are talking about a: ]

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?

Anton created a chart listing different types of materials. which best complete the chart?