Biology 1201A Lecture Notes - Lecture 2: Polycyclic Aromatic Hydrocarbon, Allan Hills 84001, Reducing Atmosphere
25 Nov 2016
School
Department
Course
Professor
Document Summary
Evolutionary timeline: universe formed 15 billion years ago (big bang, earth formed ~ 4. 6 billion years ago, first life 4 billion years ago, eukaryotic fossils 2. 2 billion years ago, homo sapiens ~ 150,000 years. What is life: the frog is alive, the rock is not. These types of elements found in the rock and the frog are the same. Both obey the same fundamental laws of physics and chemistry. So what is the difference: all life is composed of one or more cells. The fundamental (smallest) unit of all life. Arise from the growth and division of other cells. Origin: what is life: life is easy to recognize - dif cult to de ne. 7 characteristics are shared by all forms of life: the virus is unable to replicate by itself. Life is emergent: a termite cathedral emerges from the simple work of thousands of individual termites. No plan or instructions: complex properties of life emerge from simple molecular interactions.
