cell organelles function

cell is the basic unit of life.

now what do you mean by basic. here basic means the smallest unit

 Membranes & Cell Coverings

• plasma membrane function
  
• What are the main components of cell membranes? 
  
• What does the composition of a membrane tell you in general about permeability into a cell?
  
• Animal cell glycocalyx

• What is the purpose of the microvilli?
  
• specialized cell junctions
  

-adhesive junctions (desmosomes)

-tight junctions

-gap junctions

• Cell Coverings in Plants

-cell wall

-plasmodesmata
-middle lamella

2. Endoplasmic reticulum (ER)

• Part of an extensive internal membrane system characteristic of eukaryotic cells.
  
• Types of ER

        -rough (RER) 
        -smooth (SER)

• Functions

3. Golgi Apparatus

• Part of the internal membrane system
• Distinctive structure
• Functions
  

4. Nuclear envelope

• Two membrane surrounding chromosomes
  
• Comes from ER
• Contains "pores"
  
• What sort of molecules move between nucleus and cytoplasm?
  

5. Cytoplasmic matrix

What is the matrix?

What does the matrix do?

The cytoplasmic matrix has both a viscous flow like a liquid and elastic deformation like a solid (matrix near plasma membrane is more solid and in the cell center more liquid). Why?

6. Cytoskeleton

What is the cytoskeleton made of?

What does it do?

Examples

Membrane Bound Organelles

7. Nucleus

• site of storage & replication of most cells hereditary material
• contains chromosomes
• contains nucleoli  
  
• the degree of DNA packaging in chromatin depends on the state of the cell
  
• single large DNA molecule in each chromosome many times longer than the chromosome
  
• How is this compaction accomplished?
  

8. Lysosomes

• single membrane bound organelle containing digestive enzymes
• produced from the Golgi Complex
  
• Functions