BIOL-1506EL Lecture Notes - Lecture 1: Mutation Rate, Organelle, Adenine
27 Sep 2016
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Syllabus section 1-3: geological history of the earth. The earth was formed approximately billion years ago and humans have only been here for 150 thousand. Earliest evidence of life: found in fossils called stromatolites, layered rock that is formed when microorganisms bind particles of sediment together. The oldest being formed about 3. 5 billion years ago: modern day stromatolites are formed by the action of a specific photosynthetic bacteria called cyanobacteria. From an older form of cyanobacteria, oxygen was released during photosynthesis: cyanobacteria were the earlies known form of prokaryotic organisms, the earliest form of life were most likely heterotrophs, which are organisms that obtain carbon from organic molecules. Humans, animals: autotrophs obtain carbon from the environment in an inorganic form, most often carbon dioxide. Plants, photosynthesis: the earliest type of photosynthesis was called anoxygenic photosynthesis. Life is composed of cells and holds the ability to reproduce.
