Heavy DNA ( N15 DNA), hybrid DNA, and light DNA ( N14 DNA) can be separated by centrifugation. Of cells containing N15 DNA are transferred to a medium with only N14 NH4Cl as a nitrogen source, what percent of daughter molecules are composed of hybrid DNA after 4 generations

Viruses are different from bacteria in that they can remain dormant on non-living surfaces they can be found just about anywhere they can infect just about every form of life

__1__ is a climate cycle where the temperature of the __2__ ocean changes because of movements of air and ocean currents. during this period, the trade winds in the south __3__ , causing the __4__ water to move from the __5__ region to the __6__ region. 1) el nino or the monsoon 2) atlantic, indian, or pacific 3) reverse, strengthen, or weaken 4) cold or warm 5) eastern or western 6) eastern or western

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review