4 - * BIO 311C Fall 2010 You will learn most from each...

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BIO 311C Fall 2010 Lecture 4 – Wednesday 1 Sept. 2010 You will learn most from each lecture if you examine the PowerPoint slides and read the corresponding textbook assignment before the lecture. 1 *
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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 2
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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 3
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Most eukaryotic cells are greater than 5 μm in length. Nearly every imaginable shape is represented by some eukaryotic cell. a muscle cell Paramecium A single-celled protist a nerve cell 20 μm 4 plant cells
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Example: Nervous system communication (a kind of electrical communication) Cells of multicellular eukaryotes communicate extensively with each other. 5 Example: circulatory system communication (a kind of chemical communication) hormones circulate in the bloodstream coordinated muscle functions depend on proper nerve communication
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varied that it is useful to systematically categorize them. an animal cell
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This note was uploaded on 01/21/2011 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas at Austin.

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4 - * BIO 311C Fall 2010 You will learn most from each...

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