Work Step by Step
Option B is incorrect. Because protists are eukaryotes, they all have membrane-bound nuclei. Option C is incorrect. Some protists such as euglenoids move by means of flagella. Option D is incorrect. Some protists such as paramecia are ciliates, which move by means of cilia. Option A is correct. The cell walls of protists do not contain peptidoglycan, which is a constituent of the cell walls of some bacteria.