Biology 1002B Lecture Notes - Lecture 2: Abiogenesis, Antiemetic, Ribose

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Atoms molecules macromolecules cells organelles tissues organs organisms. Structural/functional complexity of living systems > the sum of its parts (also fundamentally diff. ) ***viruses can reproduce and evolve, but only on the bases of its ability to infect cells not alive. Although they contain dna and rna, they lack cellular machinery and metabolism to synthesize their own proteins must infect others and use their translational machinery. Earth is 4. 6 billion years old; life developed early: stromatolites (3. 5 bya) oldest fossilized structure remains. Layered rock formed when microorganisms bind particles of sediment together,thin sheets. Not earliest forms of life, but were preceded by simpler organisms. Life after 600 my after formation of planet - around 4 bya. Archaea are more closely related to eukaryotes than bacteria. Heterotrophs first life forms: obtain carbon from organic molecules (sugar, protein, fat) - mammals. Autotrophs: obtain carbon from environment in an inorganic form (co 2) plants: oxygenic photosynthesis led to rise in oxygen in the atmosphere.

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