section 2

• Cell theory was developed by 3 German scientists in the 1840's: Schleiden, Schwann and Virchow.
• There are 3 statements of cell theory: all organisms are made up of cells, cells are the basic unit of structure and function in all organisms, and all cells arise from existing cells.
• Cells need a large surface area to volume ratio.
• There are 2 types of cells: Prokaroyte and Eukaryote.
• Prokaryote is a single celled organism that has no nucleus or other membrane bound compartments.
• An example of a prokaryote cell is bacteria.
• Eukaryote is an organism whose cell or cells have a membrane bound nucleus(containing DNA) and other membrane bound compartments.
• An example of a eukaryote cell is a human.
• There are 5 common cell features in all cells: cell membrane, cytoplasm, cytoskeleton, ribosomes, and DNA.
• The cell membrane has 3 functions: encloses a cell, separates cell interior from environment, and regulates what enters and leaves a cell.
• The cytoplasm is the fluid interior of the cell.
• Cytoskeleton is a system of microscopic fibers which suspend cytoplasmic structures.
• Ribosomes are the intracellular structures responsible for protein production.
• DNA in a prokaryote cell is in a circular loop and DNA in an eukaryote cell is linear inside the nucleus.