In your own words describe planetary retrograde motion.Why do you think the concept of planetary retrograde motion confuses so many people? In skeletal muscle, the muscle cell mitochondria contain the protein that you want to isolate. You should get the protein isolated from the muscle and mitochondria. Explain what you need to consider before you start working and how to get the protein isolated and purified. What methods would you use? Also describe the steps of the methods in more detail.