Biology 1202B Lecture Notes - Lecture 20: Termite, Macromolecule, Reducing Atmosphere
16 Mar 2016
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Biology 1202b lecture 20: origin of life and rna i. Universe formed 15 billion years ago (big bang) Eukaryotic fossils 2. 2 billion years ago. All life is composed of 1 or more cells: the fundamental unit of all life, arise from the growth and division of other cells, cell theory. Life is easy to recognize difficult to define: 7 characteristics are shared by all forms of life, display order, harness and utilize energy, reproduce, respond to stimuli, exhibit homeostasis, evolve, growth and development. The virus is unable to replicate by itself: it is not alive. A termite cathedral emerges from the simple work of thousands of individual termites: no plan, no instructions. Complex properties of life emerge from simple molecular interactions. The region around a star where water can exist in liquid state: distance depends on energy output of parent star. Nucleic acids, proteins, carbohydrates, lipids (not a macromolecule) 3 hypothesis about the creation of life on earth.
