Of the three key building blocks of dna, which type(s) of building block is/are negatively charged and oriented on the outside of the double helical structure?

Acommon kind of mechanical weathering is called

The carrier molecules of the electron transport system are located in the

Compare the parts of a cell and the cell as a whole to another common nonliving system (i. e., a car, a city, describe the parts of a cell and their primary function.