Biology 1202B Lecture Notes - Lecture 1: Oxygen-Evolving Complex, Dna Virus, Ribozyme

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Life is defined most effectively by a list attributes that all forms of life posses. Each characteristic of life reflects a remarkable complexity resulting from a hierarchy of interactions that begins with atoms and progresses through molecules to macromolecules and cells. Cells with characteristics of life arose out of a mixture of molecules that existed on primordial earth. Earth is situated at a position where heat from the sun allows for surface temperatures to be within a range that allows water to exist in a liquid state. All forms of life are composed of the major macromolecules nucleic acids, proteins, lipids and carbohydrates. Hypotheses 2: deep sea vents: complex organic molecules necessary for life could have originated on the ocean floor at the site of deep sea vents. Synthesis of proteins and nucleic acids requires protein based catalysts called enzymes and results in macromolecules that often consist of hundreds to thousands of monomers linked together.

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