Why is the hoover dam called an arch grab the dam

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously

Is dna the same in every cell in the human body explain your answer