Chapter 12 Protozoa – single-celled eukaryotes, free- living or parasitic, feed on organic matter (other organisms or organic tissues and debris protozoa alveoli – essential for some parasitic alveolates motility and invasion of host cells, tubular mitochondrial cristae. pseudopods – temporary projection of the cytoplasm of a eukaryotic cell, amoeba or a white blood cell, organ of locomotion or prehension “false feet” kinetoplast – network of circular DNA kDNA inside a large mitochondrion that contains many copies of the mitochondrial genome.