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=1. HEADING 1=

1.1 HEADING 2

 * 1.1.1 NOTES
 * 1.1.2 NOTES
 * 1.1.3 NOTES

1.2 HEADING 2

 * 1.1.1 NOTES
 * 1.1.1 NOTES
 * 1.1.2 NOTES


 *  **Function** **: acts to control the metabolic activities of the cell. Is the central control centre which monitors internal and external conditions and turns on or off different genetic programs **
 * **General Structure** **:  is surrounded by a membrane which is similar in structure to the plasma or cell membrane. **
 * **Nuclear pores or holes occur at intervals along the membrane. **
 * **These holes provide a way for the nucleus to communicate with the cytoplasm. **
 * **Substances pass in and out of the nucleus through these openings **
 * **Components of Nucleus:**
 * 1) **Nuclear Envelop**
 * 2) **Chromatin**
 * 3) **Nucleolus**
 * 4) **Nucleoplasm**

** B8-i: Nuclear Envelop **

 * **Function**: selectively permeable to control movement in or out
 * **Structure**:
 * contains 2 unit membranes with fluid-filled space
 * present nuclear pores
 * outer membrane may be continuous with endoplasmic reticulum

** B8-ii: Chromatin **
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 * **Function**: Contains instructions that control cells metabolism and heredity
 * **Structure**: composed of long thin strands of DNA

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