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Clase 3a 22008

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Published in: Travel, Economy & Finance

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  • 1. ORIGEN DE LA VIDA (3.800 m. a.) Unión química de • base nitrogenada • ácido fosfórico Nucleótido • monosacárido Ácidos nucleicos AUTORREPLICACIÓN Primera molécula biológica ARN ADN Pared celular Primeras Bacterias
  • 2. CARACTERÍSTICAS DE PRIMEROS SERES VIVOS Unicelulares Atmósfera primitiva sin oxígeno (O2) → Anaerobios Reductora → se incorporan electrones a moléculas Heterótrofos → Fermentación ⇒ Energía Océano EVOLUCIÓN BIOLÓGICA • Competencia y sobrevivencia • Mutación (variabilidad) y Selección