The key organelles, the mitochondrion, chloroplast, and hydrogenosomes, are derived from endosymbiotic prokaryotes of the domain Bacteria. Protozoa are unicellular microbial Eukarya that lack cell walls, and are usually motile by various means. Many protozoa are pathogenic to humans and other animals. List at least two major ways in which the protozoan Paramecium differs from the protozoan Trypanosoma . Section 17.4 Fungi include the molds and yeasts, and as a group differ from protozoa by virtue of their rigid cell wall, production of spores, lack of motility, and phylogenetic position.
Mushrooms are large, often edible fungi that produce fruiting bodies containing basidiospores.
Slime molds are nonphototrophic motile cells. Acellular slime molds are masses of motile protoplasm that form less highly differentiated structures than in cellular slime molds. Cellular slime molds are masses of individual cells that aggregate to form fruiting bodies from which spores are eventually released. What is a macrocyst, and what types of slime molds produce them. Section 17.6 Algae are phototrophic Eukarya that contain photosynthetic pigments within a structure called the chloroplast.