Suppose a team of scientists is examining the cells of a newly discovered species. They observe under the light microscope an organelle that appears to be different from any that has been described before. Assume that you are director of the research team. Describe the methods that you would have the team use to determine whether the structure is a mitochondrion, ribosome, lysosome, nucleolus, or indeed a new organelle. Discuss the advantages and limitations of each method in revealing the role of the unknown organelle in the living cell.