What was the purpose of treating the radish seeds for the lab "Radical
Radishes" with radioactive cobalt-60?
A. To cause mutations in the radish embryos
B. To kill all the living microorganisms on the seeds
C. To hybridize normal radish DNA with a radioactive DNA probe
D. To produce labeled probes with radish DNA

Based on their location in the atmosphere, the layers are able to have their own special characteristics. for example, most weather occurs in the troposphere. what occurs in each of the other layers? (site 1)

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?

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air