BIOA01H3 Chapter Notes - Chapter 22: Protist, Motility, Body Plan

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Monica Sauer

Document Summary

Most are unicellular and microscopic, but some are large, multicellular organisms. This kingdom has traditionally been a catch-all group that consists of those eukaryotes that are not animals, fungi, or plants. Protists have microtubules and microfilaments, which provide motility and cytoskeletal support. They share characteristics of transcription and translation with other eukaryotes. All of the organisms in the eukaryotic lineages consist of protists except for three groups, the animals, land plants, and fungi, which arose from protist ancestors. In contrast to fungi, most protists are motile or have motile stages in their life cycles, and their cell walls are made of cellulose, not chitin. Unlike plants, many photoautotrophic protists can also live as heterotrophs, and some regularly combine both modes of nutrition: photosynthetic protists are sometimes referred to as algae; these protists are generally aquatic and often unicellular and microscopic.