A biologist wants to use a radioactive isotope of nitrogen to radiolabel certain molecules in a culture of cells she is growing. If the biologist incubates her cells with N-15 ( a heavy isotope of nitrogen), which group of macromolecules will be labeled in the culture of cells?

Nucleic acids and proteins

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this