Lecture 4.Jan27 - BIO 311C Spring 2010 You will learn most from each lecture if your read the corresponding textbook assignment before the lecture

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BIO 311C Spring 2010 Lecture 4 – Wednesday 27 Jan. 2010 * Recall that all presentation slides with an asterisk in the lower-right corner are placed on the course web site. You will learn most from each lecture if your read the corresponding textbook assignment before the lecture. 1
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Five Major Model Organisms Arabidopsis thaliana a little weedy plant A large portion of modern cell & molecular biology research uses these five model organisms. * E. coli a prokaryote Caenorhabditis elegans a roundworm Drosophila melanogaster a fruit fly Mus musculus a mouse 3
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- Prokaryotic cells are generally much smaller and less complex in shape than are typical eukaryotic cells. - There is no communication among cells of prokaryotic organisms that contain more than one cell. Generally cells of multicellular eukaryotic organisms are in close communication with each other. - The genetic content of prokaryotic cells most often occurs as a single circular molecule of DNA; some also contain plasmids. Most of the genetic content of eukaryotic cells occurs in a special compartment (the nucleus) and consists of two or more linear (noncircular) chromosomes. DNA also occurs in special compartments (e.g. mitochondria) of eukaryotic cells. - Prokaryotic cells generally do not contain membrane-bounded organelles or a prominent cytoskeleton, while eukaryotic cells do contain these kinds of structures. Some Ways that Prokaryotic Cells Differ from Eukaryotic Cells * 4
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Most eukaryotic cells are much larger and much more complex than prokaryotic cells. animal cell, a typical eukaryotic cell prokaryotic cell These cells are illustrated in their approximate relative sizes * 5
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- Most are greater than 5 μ m in length. - Practically every imaginable shape is represented by some eukaryotic cell. - Some exist as unicellular organisms and others as a unit of a multicellular organism. Cells of most multicellular eukaryotes communicate extensively with each other. - They contain relatively large and dense (80S) ribosomes in their cytoplasm
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This note was uploaded on 06/11/2010 for the course BIO 48765 taught by Professor Sathasvian during the Spring '10 term at University of Texas at Austin.

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Lecture 4.Jan27 - BIO 311C Spring 2010 You will learn most from each lecture if your read the corresponding textbook assignment before the lecture

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