Scientists have discovered that turning off two genes in the muscle tissue of experimental mice severely limits their ability to run, and two genes control the synthesis of a protein called AMPK in mouse skeletal muscles (muscles that control movement in the body). Being able to produce energy from sugar, if this process is disturbed and the energy-producing mitochondria are low, the muscles will not work properly. So scientists believe that the differences between people sitting on the couch all day and Olympic athletes may be all Derived from genes. If the following are true, which most supports the opinion of scientists:. ['erson who has been on the sofa all day can become an Olympian with the help of technology.', 'Some Olympians contain genes that synthesize AMPK protein that ordinary people do not have.', "Turning off genes that make up AMPK protein limits mice's ability to run.", 'ome studies show that genetically modified mice have improved running ability.']