I NEED HELP ASAP A biologist examining an organelle with a electron microscope, which is strong enough to see the interior of a cell. She makes note that she is looking at a eukaryotic cell. She observes a continuous network on membranes, that look like flat, stacked, sac-like structures. The tubed membranes are in the vicinity of the nucleus and have small, round structures on the outside of the membranes. What cell organelle is being observed?