BIOL 1000 Chapter Notes - Chapter 3: Endoplasmic Reticulum, Falsifiability, Chloroplast
22 Apr 2014
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3. 3 from macromolecules to life: early metabolism was probably based on simple oxidation-reduction reactions. 3. 4 the earliest forms of life: some early cells developed the capacity to carry out photosynthesis, the oxygen produced as a by-product accumulated. Oxidising character of earth"s atmosphere increased: from this time on, organic molecules produced in the environment were quickly broken down. Life could only arise from pre-existing life; as it is today: we are all (bacteria, archaea, eukarya) descended from luca. Why is carbon necessary: carbon is the backbone/basis of all organic molecules in existence, organisms are constantly producing these organic molecules to keep them running. Obtaining carbon: heterotrophs obtain organic carbon by consuming other organisms, autotrophs synthesize organic carbon molecules using inorganic carbon, co2. Obtaining energy: phototrophs use light as a source of energy for photosynthesis, chemotrophs oxidation of organic or inorganic substances. Evolved several times, producing lineages of several algae and ancestors of fungi, plants, and animals.
