BIOL 1030 Lecture 8: Chapter Twenty Eight (January 28, 2019)

• School: Auburn University
• Department: Biology
• Course: BIOL 1030
• Professor: Margaret Jane Ballen

Document Summary

First organisms to appear on earth, so used to extreme environments. Extremophiles: include methanogens, extreme me halophiles, and extreme thermophiles. Distinguished from other prokaryotes (bacteria) mainly by ribosomal rna mainly by ribosomal rna sequence and lack of peptidoglycan in their cell walls. Very abundant and diverse group of bacteria; defined best as prokaryotes that are not archaea. Examples: blue-green algae (cyanobacteria), escherichia coli (a proteobacterium) One clade, eukarya, consists of eukaryotes, organisms with a discrete cellular nucleus (and other internal membrane-bound organelles); it"s divided into four groups: Single celled and simple multicellular organisms having nuclei. Includes protozoa, algae, water molds, and slime molds. Most (but not all) contain chlorophyll in chloroplasts. Complex multicellular organisms that must eat other organisms for nourishment. Typically contain cells lacking walls and have organs and organ systems. Most (but not all) are motile (can move) Flexible cell surface (loss of firm cell wall) Eukaryotic cell is a fusion of different lineages (archaea and bacteria)