Biology 1001A Lecture Notes - Lecture 2: Hydrogen Sulfide, Ribozyme, Stromatolite
23 Mar 2014
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Biology chapter 2- origins of life (lecture 2) Unicellular organism- one cell is a functionally independent organism. Life activities divided among specialized cells: the cell is the smallest unit that has the properties of life. If the cell is broken open the property of life is lost (unable to grow, reproduce, respond to outside stimuli: cell arise only from the growth and division of pre-existing cells. Dna and rna cannot orchestrate the formation of an entire cell, only division of cell can. A- because they lack the cellular machinery to synthesize their own. 2. 2-the chemical origins of life: the solar system and earth were formed about 4. 6 billion years ago. Demonstrated that abiotic synthesis of biologically important molecules is possible. Organic molecules that formed the building blocks of life (amino acids) could have been formed given the conditions that prevailed on primitive earth, including a reducing atmosphere that lacked oxygen.
