Pulse- chase experiments performed in cells are experiments in which cells are first exposed tolabelled precursors of specific molecules for a short period of time (the pulse), unincorporated labelledprecursors are then washed away, and presence of label in molecules of interest are followed throughtime (the chase). In an experiment designed to study gene expression, cells were exposed to labelledUTP during the pulse, and results of the chase part of the experiment are summarized in the figurebelow: