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9 - BIO 311C Fall 2010 Exam 1 in this room at this time on...

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BIO 311C Fall 2010 Lecture 9 – Wednesday 15 Sept. 2010 Exam 1: in this room at this time on Friday, Feb. 12 (this Friday) You are only required to bring a pencil (preferably #2) to the exam. You will not be allowed to use a calculator or any notes during the exam. 1
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Some Common Features of prokaryotic cells, mitochondria and plastids They all contain prokaryotic-type "chromosomes" that are not like eukaryotic chromatin. They all have prokaryote-like protein-synthesizing machinery. The inner membranes of mitochondrial and chloroplast envelopes are more similar to the plasma membrane of prokaryotic cells than to the membranes of components of the endomembrane system. 2
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Some Evidence for the Endosymbiotic Origin of Mitochondria and Plastids Their chromosomes, protein-synthesizing machinery and membrane composition are similar in chemical compositoin to those of prokaryotes. Their genetic information is stored and expressed very similar to the way that prokaryotic genetic information is stored and expressed. Some existing eukaryotic cells contain parasitic prokaryotic cells as obligate endosymbionts. These endosymbionts depend on the host cell for many of their food and energy needs. A few non-photosynthetic eukaryotes that eat photosynthetic organisms are able to preserve the chloroplasts of ingested organisms in special intracellular compartments, where the chloroplasts continue to do photosynthesis for several weeks.
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