Biology 1202B Lecture Notes - Lecture 20: Protein Structure, Horizontal Gene Transfer, Polycyclic Aromatic Hydrocarbon
10 May 2016
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Document Summary
Universe formed 15 billion years ago (big bang) Took awhile to cool down and began the formation of organic molecules, which are the monomers that form the basis of life. Made of tiny molecules composed of bigger molecules. The frog is alive, the rock is not. The types of elements found in the rock and the frog are the same. Both obey the same fundamental laws of physics & chemistry. 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. States that the object must be created of cells. Cells occur because of the growth and division of other cells. Life is easy to recognize difficult to define. 7 characteristics are shared by all forms of life. The virus is unable to replicate by itself; needs a host organism. Can detect stimuli in the environment and respond.
