While creating a piece of artwork, lupita becomes curious about the ink she using to create her art. she wonders if the ink is pure substance or a mixture. the ink separates when a chromatography experiment is performed on it , leaving multiple marks of different colors along the chromatography paper. when the ink is left out for twenty four hours, the ink settles into individual components. using her observations of the properties of the ink, the student can classify it as

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?

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased