Nucleus:
The nucleus of a cell is, without doubt, one of the most important parts of the cell. The nucleus instructs every single part of the cell what to do, and what the different organelles need to do. The nucleus includes chromatin (protein and DNA). It also contains Nucleolus (nucleoli is plural). These nucleoli are responsible for ribosome production. If the nucleus were to suddenly malfunction, this would mean that the cell would have no directions, and nothing to direct them, so all activity would completely stop.
Cell Membrane:
The cell membrane is the organelle in the cell which determines what can come in and out of the cell. The cell membrane itself is a double layer of phospholipids, and this appears