Protozoans are autotrophic, and algae are heterotrophic. Algae are photosynthetic, and almost all protozoans are heterotrophic. Algae are prokaryotes, and protozoans are eukaryotes. The inner membrane of a chloroplast is similar to prokaryotic membranes. Mitochondria and chloroplasts are surrounded by two membranes.
Mitochondria reproduce by binary fission.
The DNA in the eukaryotic nucleus codes for some enzymes in mitochondria. Plant cells have rigid cellulose walls, and algae cells do not. The diploid generation of the plant life cycle always a. produces spores b. is called the gametophyte. The diploid sporophyte stage is dominant in the life cycles of all of the following except a. a pine tree. Deep in the tropical rain forest, a botanist discovered an unusual plant with highly developed vascular tissue, flagellated sperm, cone-like reproductive structures bearing seeds, and an alternation of generations life cycle.