The nucleus and other organelles

The nucleus and other organelles -...

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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 manufacturing the  components of ribosomes. The components of ribosomes move to the  cytoplasm to form a complete ribosome. The ribosome will eventually  assemble amino acids into proteins. The nucleus also serves as the site for  the separation of chromosomes during cell division. The 
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The nucleus and other organelles -...

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