19.
You receive a sample slide of an organism. While observing it under a microscope, you notice that the organism is single-celled and green in color. There are multiple individual organisms on the slide. Based on this initial information, you guess that it is either a bacterium or a protist. Which trait is least likely to help you identify the correct group of this organism?
the presence of cell structures in the cell
the absence of a nucleus
the absence of cell structure membranes
the presence of different cell shapes