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Unformatted text preview: Bio 1A. January 28, 2009 Lecture 4. Wilt Organelles It is important to realize that the different constituents of the cell, the organelles, are not static, but are very dynamic. For example, mitochondria are changing shape, and dividing. Macromolecules are constantly moving in and out of the nucleus. The cytoskeleton is constantly changing its architecture. Small vesicles are moving and fusing in the cytosol. I. Membrane bounded organelles (dynamic behavior and assembly) A. The Nucleus (double membrane) 1. nucleolus . ribosomal RNA genes and assembly of ribosomes 2. chromatin , chromosomes . The chromatin folding (condensation) cycle. Histone proteins, non-histone proteins, DNA, and nucleosomes. Modification of histones. 3. nuclear sap ( does it have domains?), nuclear membranes (envelope; outer membrane continuous with e.r.), nuclear pores , nuclear laminae (lamin intermediate mesh). B. Mitochondria (double membrane) 1. Outer membrane, Inner membrane and its Cristae , mitochondrial matrix...
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- Spring '08