Why is it particularly useful to study identical twins who were raised in different environments?
a. it is possible that high concordance rates between identical twins reared together is due to their being treated more similarly than nonidentical twins.
b. concordance rates tend to be higher.
c. it is possible that the genetics of twins who have been separated have changed in ways to explain any differences found.
d. differences in brain function can easily be identified?

Which of these statements are true about scientific theories and hypothesis

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of 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?