BIOL 1107 Chapter Notes - Chapter 55-75: Total S.A., Surface Tension, Water Vapor
Document Summary
Water and carbon: the chemical basis of life. Louis pasteur tested idea organisms arise from nonliving substances: results built consensus that spontaneous generation does not occur. Theory of chemical evolution- maintains that inputs of energy led to formation of incr. complex carbon-containing substances, culminating in molecule could replicate itself: switch from chem. Evolution: process of evolution by natural selection took over. Descendent of original molecule became metabolically active & required membrane. 2. 1 atoms, ions, and molecules: the building blocks of chemical evolution. Hydrogen, carbon, nitrogen, and oxygen make 96% of matter found in organisms today. Electrons orbit atomic nucleus made up of larger particles called protons & neutrons. Every element except h has 1+ neutrons in nucleus. When # of protons & electrons are same charges balance = atom electrically neutral. Periodic table: each atom of element contains characteristic # of protons (atomic number)
