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?

Which of the following does not make up ground substance of connective tissue? hyaluronic acid elastic fibers glycosaminoglycan proteoglycan

Which contributions did galileo make to the model of the solar system? check all that apply. a mathematical model for the orbits of the planets scientifically accurate data on planetary orbits data that showed that planets reflected sunlight similar to earth's moon up the idea that stars are other suns that do not move u observations of the moons of jupiter rotating around the gas giant

What blood vessels carry blood to the heart? away from the heart?