Bio notes 2 - Zhaonan Liu Bio 101 THE UNITY AND DIVERSITY...

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Zhaonan Liu August 27, 2007 Bio 101 Lecture 2 THE UNITY AND DIVERSITY OF LIFE All living organisms share the same basic structural features: Molecular All organisms use nucleic acids, RNA or DNA, as hereditary material. All share the same genetic code. All use similar molecules (proteins) as enzymes. Shared biochemical pathways (E. coli and elephants). Cellular All organisms composed of cells. Cells are composed of the same basic elements (cell components). Molecular Unity: Genetic code Triplets of nucleotides called codons encode 1 of 20 amino acids Amino acids form proteins The code is the same for all life Molecular Unity: Biochemistry ATP is used as a source of energy within all organisms Cellular Unity All organisms are composed of cells with similar components Membrane bound Cytoplasm Chromosomes Ribosomes Multicellular eukaryotes organize their cells into tissues THE DIVERSITY OF LIFE Living organisms are extremely diverse, even within groups Endless Forms How many species? 4675 Mammals
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This note was uploaded on 02/23/2008 for the course BIO G 101 taught by Professor Gilbert,c. during the Fall '07 term at Cornell University (Engineering School).

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Bio notes 2 - Zhaonan Liu Bio 101 THE UNITY AND DIVERSITY...

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