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All organisms are composed of cells
Cells are the smallest working units of all living things
All cells come from preexistin cells through cell division
Do not have structures surrounded by membranes
Few internal structures
One-celled organisms: Bacteria
Outer membrane of a cell that controls movement in and out of cells
Made of two layers
Openings allow material to enter and leave nucleus
Smooth types: lacks ribosomes
Rough types: ribosome ebbed on surface
Attached to / near cytoplasm
Each cell contains thousands
Make proteins / lipids
Found on cytoplasm and floating throughout the cell
Produces energy through chemical reactions - breaking down fats and carbohydrates
Controls level of water and other materials in cell
not attached to cytoplasm
Protein packaging plant
Move material with cell
Move materials out of cell
Not attached to cytoplasm
Digestive 'plant' for proteins, fats and carbohydrates
Transports undigested material to cell membrane
Cell breaks down if lysosomes explodes
Found in animal-cells because they need it more
One is found in plant cell
Membrane - bound sace for storage, digestion and waste removal
Contains water solution
Helps plants maintain shape
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