Tour of the cell

plant and animal cell

• animal cells don't have a cell wall, or chloroplast.
• both have a plasma membrane.
• plant cells don't have flagellum centriole.
• each cell had a prominent nucleus.
• cytoplasm is between the nucleus and the plasma membrane

Prokaryotic and eukaryotic cells

• prokaryotic cells do not have a nucleus and most other organelles
• eukaryotic cells have a nucleus surrounded by its own membrane
• the Greek meaning of eukaryotic is "true kernel"
• kernel means nucleus which prokaryotic cells lack
• eukaryotic cells are typically 10-100 micrometers in diameter

Cell theory

• micrograph-a photo of the view through a microscope
• cell theory-all living things are made of cells
• the cell is the basic unit of structure and function in living things
• cell structure is so small the even magnifying it 1000x isn't enough to see it
• light microscopes can magnify things as small as bacterium or larger

passive and active transport

• diffusion across a membrane is passive transport
• active transport is when a cell uses energy to move molecules
• active transport plays a part in maintaining the cells chem. environment
• specific proteins allow the passive transport of different substances
• small molecules pass readily through passive transport than large ones

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