Ageologist is studying rock layers in an old river bed, and he finds a fossil of a fish and a horsetail rush in the same rock layer. according to the law of faunal and floral succession, the geologist can assume that the rock containing the fossils may date back as far as the

Where is energy trapped inside the organelle chlorophyll

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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.