6. How does cell structure suggest cell function? 7. How are substances and structures transported within the cell? 9. 8. Why do you think that cells producing large numbers of proteins have a greater number of rough endoplasmic reticula than those producing fewer proteins? Exploring the South American rainforest, a scientist discovers a mysterious organism and brings it back to the lab for further study. What cell characteristics should the scientist examine to tell whether the organism is an animal or plant? Why?