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Biology 311C Lecture 10 - Biology 311C Lecture 10 The...

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September 16, 2011 Biology 311C Lecture 10 The reason bacteria and archaea are in different domains because bacteria have different cell walls and ribose. Bacteria and archaea used to be in the same domain, but they are genetically different. The first organism that may have originated first was simple bacteria. Unicellular fungi are eukaryotic. The first cells were not capable of photosynthesis so cyanobacteria is not possible. Eukaryotic organisms can trace their ancestor to a r chaebacteria. As of now, life exists only on earth. Some plants have complex life forms that may have evolved independent of other similar plants. However, we have no evidence to support that yet! The cell is the simplest collection of matter than can be alive. All cells are related by descent from earlier cells. Cells rely on the integration of structures in order to function. For example, a macrophage’s ability to destroy bacteria involves the whole cell, coordinating components such as the cytoskeleton, lysosomes, and plasma membrane.
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