Cataracts Facts. 1  Cataracts are changes in clarity of the natural lens inside the eye that gradually degrade visual quality. The natural lens sits behind the colored part of the eye (iris) in the area of the pupil, and cannot be directly seen with the naked eye unless it becomes extremely cloudy.
Hershey and Chase. Alfred Hershey and Martha Chase did an Experiment in 1952 that was called the Hershey-Chase Experiment. This experiment set out to determine what composed the genetic material of a bacteriophage. A bacteriophage is a virus that infects a bacterium.
Only 20% of the 32 P remained outside the cell, demonstrating that it was incorporated with DNA in the cell's genetic material. All of the 35 S in the protein coats remained outside the cell, showing it was not incorporated into the cell, and that protein is not the genetic material.he results of the AveryâMacLeodâMcCarty experiment, published in 1944, suggested that DNA was the genetic material, but there was still some hesitation within the general scientific community to accept this, which set the stage for the HersheyâChase experiment.