1. Cell Structure

2. Cell Structure

3. Cell Structure Cytoplasm
Fluid material in which the cell contents are suspended
75% - 90% water
Cytoskeleton
framework of protein fibres
Microtubules: hollow rods which keep organelles in place + move them around cell
Microfilaments: (smaller) move materials around cell or move whole cell

4. Cell Structure Organelles Nucleus
- Surrounded by a nuclear membrane (double membrane) with nuclear pores
Contains genetic material (DNA)
- DNA determines which enzymes (proteins) will be made by cell therefore controlling the functioning of the cell
- Nucleolus contains RNA (protein synthesis)
- Filled with nucleoplasm
Ribosomes
small spherical structures which assist in protein production
(amino acids  polypeptides / proteins)

5. Cell Structure Endoplasmic reticulum
- Network of channels formed by pairs of parallel membranes which connect with cell and nuclear membranes
- Provide surface for chem.. reactions and channels allow molecule storage and transport
Rough / Granular ER: Ribosomes attached
Smooth / Agranular ER: No ribosomes
 Golgi Apparatus
- series of flattened membranous bags which function to modify proteins and package them for secretion
- addition of sugar, sulphate, phosphate, fatty acids
- Ends of golgi apparatus pinch off to form vesicles with proteins inside   

6. Cell Structure Lysosomes
- small spheres bonded by a membrane from the golgi apparatus
- contain digestive enzymes (breaks down proteins, lipids, nucleic acids and some carbs)
Mitochondria
- spherical or sausage shaped structures with a double membrane (the inner one is folded)
- contains enzymes which are involved in chem. reactions which release energy   
Centrioles
- pair of cylindrical structures (which are at right angles) made up of a ring of very fine tubes
- involved in cellular reproduction
Cilia / Flagella
Cilia: fine hair like projections which assist in movement along the cell membrane
Flagella: one or two longer tail like projections