Bats have a poor sense of sight, so they hunt their prey by emitting a high-frequency sound. they wait for an echo to bounce off a moving or stationary object. based on the echo, they can determine if prey is nearby. which types of sensory receptors bats accomplish this task?

The hershey and chase experiments involved the preparation of two different types of radioactively labeled phage. which of the following best explains why two preparations were required? a. the bacteriophage used in the experiments was a t2 phage. b. it was necessary that each of the two phage components, dna and protein, be identifiable upon recovery at the end of the experiment. c. each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope. d. establishing the identity of the genetic material required observation of two phage generations.