Identify the type of transitional word or phrase in the sentence below: he asked her to go to the prom, but she turned him down. a. chronological c. spatial b. cause and effect d. comparison and contrast

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