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.
Her breakthrough discovery, for which she was awarded the 2009 Nobel Prize in Physiology or Medicine, concerned the process by which cells replicate. Specifically, Blackburn co-discovered an enzyme called âtelomeraseâ, which rebuilds telomeres following cell division. Scientists knew that telomeres broke down during cell division, but until Blackburnâs discovery they didnât know how they were repaired afterward.