The nucleus and other organelles

The nucleus and other organelles - .(Figure2 , p

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The nucleus and other organelles Organelles  are bodies within the cytoplasm that serve to physically separate the various metabolic  activities that occur within cells. They include the following (Figure 2):  The  nucleus  is bounded by the nuclear envelope, a phospholipid bilayer similar to the  plasma membrane. The nucleus contains DNA (deoxyribonucleic acid), the hereditary  information of the cell. Normally, the DNA is spread out within the nucleus as a threadlike  matrix called  chromatin.  When the cell begins to divide, the chromatin condenses into rod- shaped bodies called  chromosomes,  each of which, before dividing, is made up of two  long DNA molecules and various histone molecules. The histones serve to organize the  lengthy DNA, coiling it into bundles called nucleosomes. Also visible within the nucleus are  one or more nucleoli, each consisting of RNA that is involved in the process of 
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This note was uploaded on 11/10/2011 for the course PT 101 taught by Professor Staff during the Spring '10 term at Texas State.

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