Biology 1001A Lecture 4: 2012.09.20 - Lec 4 - Biodiversity - Lecture Outcomes.docx

• School: Western University
• Department: Biology
• Course: Biology 1001A
• Professor: Tom Haffie

Document Summary

The approximate times by which the first cells, and the first eukaryotic cells, had appeared. The two-kingdom, five-kingdom and three-kingdom (three domain) systems for classifying living things. Two kingdom: based on structure and function. Ancient system, 2,000 years old: plantae (plants): photosynthesize, do not move, animalia (animals): most consume own food, move about, no seeds or spores, later, prokaryotes and eukaryotes a flawed system. Five kingdom: expansion of prokaryotic vs eukaryotic system. Three kingdom (three domain): with discovery of archaebacterium by carl woese in. Main characteristics distinguishing members of the eubacteria, archaea, eukaryota domains of life. Eubacteria includes bacteria and cyanobacteria: the earliest known organisms, now fossilized. Archaea are unicellular organisms, whose cell wall has a unique composition. They can thrive in extremely hostile environments (e. g. sulphuric hot springs, deep ocean vents, etc) Eukarya includes some unicellular organisms (slime molds, ciliates, trypanosomes, etc) and multicellular organisms (plants, animals, fungi)