A student is interested in the half-life of enzyme X. She injectsrats with a particular 14C-labeled amino acid and later isolatesher enzyme of interest. When she first isolates enzyme X she findsit contains 12,247 disintegrations per minute (dpms) per gramprotein. Four days after the initial isolation, she again isolatesenzyme X and finds it contains 3,689 dpms per gram protein. What isthe half-life of the protein?