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Biology HS/Science Unit: 11 Lesson: 02 Bacteria vs. Protists Station 1 (Description) Bacteria are some of the oldest known organisms on Earth. Although the word “Protista” comes from the word “first or “very first”, genetic analysis has shown that they are quite complex and not “primitive” at all. While bacteria and protists share some common characteristics, they are also quite different. Bacteria are all single-celled organisms. Most protists are single-celled organisms; however, there are a few protists (algae) that are multi-cellular. Some single-celled protists live in colonies. Both organisms can be either autotrophic or heterotrophic and sometimes possess flagella for movement. Protists may also move via pseudopods or cilia. Bacteria are known for being able to live in a variety of habitats; however, protists generally prefer to live in moist environments. Bacteria and fungus-like protists both have cell walls. Animal-like and plant-like protists do not have cell walls. Bacteria are prokaryotes, while protists are eukarytoes. Bacteria and protists both reproduce asexually; however, some protists can also reproduce sexually. Bacteria reproduce through binary fission, while protists reproduce through binary fission, mitosis, or sexually. ©2012, TESCCC 12/17/12 page 1 of 1
