Polymerase chain reaction (pcr) is an essential technique for the study of dna. pcr uses a dna polymerase enzyme from thermophilus aquaticus to amplify dna extracted from any sample. in order for the reaction to work, researchers must transfer microliters of sample to the reaction vessel for pcr. if a researcher has a dna sample with a concentration of 0.28 micrograms per microliter, how many microliters of dna must be transfered to conduct a 50 microliter reaction if the final concentration should be 2.2 nanograms per microliter?

Can it be a whole number or a fraction

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.