[BIOLOGY 1A03] - Final Exam Guide - Everything you need to know! (84 pages long)

• School: McMaster University
• Department: Biology
• Course: BIOLOGY 1A03
• Professor: Lovaye Kajiura

Document Summary

Eukaryotic and prokaryotic cells and the evolution of. Life as we know it, began approximately 4 billion years ago. Life on earth was almost exclusively unicellular for most of earth"s history and oxygen was virtually absent from the oceans and atmosphere. This was a very harsh and inhospitable environment. The appearance of the rst photosynthetic cells, speci cally creatures that could create oxygen, opened up the ood gates of diversity that has lead to the vast array of organisms we see today. One of the most interesting time-points in the history of life was the appearance of the rst photosynthetic cells, especially the rst photosynthetic eukaryotes that evolved in the proterozoic eon. Eukaryotic and prokaryotic cells have many structural components that are similar and others that differ. For example, both eukaryotic and prokaryotic cells have an external membrane that separates the inside of the cell from the outside of the cell.