Past simple or past perfect simple - fill in the correct form 1. I (not tell) my teacher that my mum (help) me with my homework.
2. Paul (not say) that he (take) Albert's watch.
3. The bike (be) much more expensive than he (think) at first.
4. Dad (drive) me home after I (fall) into the water.
5. Marion (ask) me what (happen) to me last week.
6. We (eat) two Big Macs before we (go) home.

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