Cell culture inserts/microporous membranes promote the proper phenotype of a variety of endothelial cells including kidney cells, intestinal epithelial cells and others. Equally as important is the fact that these devices can be used to study transcytosis, a process discussed briefly in the cell culture lecture.

What is transcytosis and why does the device described above allow one to study this process compared to a typical, plastic cell culture plate?

Where is the energy in a sucrose molecule stored? o a. inside the hydrogen atoms o b. inside the carbon atoms o c. in the bonds between the atoms o d. inside the protons

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?