A. different missions scientists are trying in space
B. the effects that tiny pieces of space junk could have on the earth
C. the problem of space junk and scientists' attempts to solve this problem
D. the problem of trash on planet Earth

In a series of experiments, hershey and chase radioactively labeled dna and protein in viruses and then used labeled viruses to infect bacteria. hershey and chase's experiments definitively showed that a. dna and not protein is the genetic material. b. dna and protein work together as a cell's genetic material. c. protein and not dna is the genetic material. d. neither dna nor protein act as a cell's genetic material