Which sentence uses the past tense of to decide correctly?
o a. karin will decide what dress to wear.
o b. karin decided what dress to wear.
c. karin is deciding what dress to wear.

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